81-x=172

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Solution for 81-x=172 equation: 


Simplifying
81 + -1x = 172

Solving
81 + -1x = 172

Solving for variable 'x'.

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

Add '-81' to each side of the equation.
81 + -81 + -1x = 172 + -81

Combine like terms: 81 + -81 = 0
0 + -1x = 172 + -81
-1x = 172 + -81

Combine like terms: 172 + -81 = 91
-1x = 91

Divide each side by '-1'.
x = -91

Simplifying
x = -91

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