172=129-x

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Solution for 172=129-x equation:


Simplifying
172 = 129 + -1x

Solving
172 = 129 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
172 + x = 129 + -1x + x

Combine like terms: -1x + x = 0
172 + x = 129 + 0
172 + x = 129

Add '-172' to each side of the equation.
172 + -172 + x = 129 + -172

Combine like terms: 172 + -172 = 0
0 + x = 129 + -172
x = 129 + -172

Combine like terms: 129 + -172 = -43
x = -43

Simplifying
x = -43

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