Solve for X Calculator

Tip: drag a photo here or paste a screenshot (Ctrl+V)

How are solve allowances used?

Math, physics, chemistry and all AI tools share your plan allowance.

Each successful standard AI submission uses one standard solve. Deep reasoning uses one deep solve instead. Both count toward the daily solve limit.

Photos and selected PDF pages also use one daily photo solve per submission. Uploading a file or selecting a page does not start a solve. PDF upload requires Plus or Pro.

Local calculations, worked examples, hints, copying answers and cached answers use no solves.

Technical failures return the reserved solve. An automatic retry is included in the same submission. A new successful AI submission counts again, even if it follows an earlier answer.

Step-by-step hints

Try:

Worked example

Step-by-step solution

$3(x - 4) + 5 = 2x + 7$

Step 1 / 4

Distribute the 3

Multiply 3 by each term inside the parentheses.

3x - 12 + 5 = 2x + 7

How to use the Solve for X Calculator

Enter an equation and this solve for x calculator isolates the variable one inverse operation at a time, so you can follow exactly how the answer is found and check your own work.

Type the equation with an equals sign, for example 3(x − 4) + 5 = 2x + 7.
Press Solve it. The calculator simplifies both sides and moves every x term to one side.
Read each step: the operation applied to both sides is shown in the math line.
Check the final answer, including any values that would make a denominator zero.

How solving for x works

An equation stays true when you do the same thing to both sides. Solving for x means undoing whatever was done to x, in reverse order: first clear parentheses and combine like terms, then add or subtract to gather the x terms, and finally multiply or divide to leave x alone.

Equations with fractions or square roots need one more check. Multiplying by a variable expression or squaring both sides can introduce extraneous solutions, so every answer is substituted back into the original equation.

Frequently asked questions

Can this calculator solve for x with fractions?

Yes. It multiplies both sides by the least common denominator to clear the fractions, solves the resulting equation and excludes any value that makes a denominator zero.

What if an equation has no solution or infinitely many?

If the x terms cancel and a false statement remains (like 3 = 7) there is no solution; if a true statement remains (like 0 = 0) every real number is a solution. The steps show which case applies.

Does it work for other variables?

Yes. Say which variable to solve for, for example “solve A = lw for w”, and the calculator isolates that variable instead.

Have a different kind of math problem? Try the free math solver. Use the subject menu for physics and chemistry.