31=3x+7-x

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Solution for 31=3x+7-x equation:


Simplifying
31 = 3x + 7 + -1x

Reorder the terms:
31 = 7 + 3x + -1x

Combine like terms: 3x + -1x = 2x
31 = 7 + 2x

Solving
31 = 7 + 2x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2x' to each side of the equation.
31 + -2x = 7 + 2x + -2x

Combine like terms: 2x + -2x = 0
31 + -2x = 7 + 0
31 + -2x = 7

Add '-31' to each side of the equation.
31 + -31 + -2x = 7 + -31

Combine like terms: 31 + -31 = 0
0 + -2x = 7 + -31
-2x = 7 + -31

Combine like terms: 7 + -31 = -24
-2x = -24

Divide each side by '-2'.
x = 12

Simplifying
x = 12

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