81-x=100

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Solution for 81-x=100 equation: 


Simplifying
81 + -1x = 100

Solving
81 + -1x = 100

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 = 100 + -81

Combine like terms: 81 + -81 = 0
0 + -1x = 100 + -81
-1x = 100 + -81

Combine like terms: 100 + -81 = 19
-1x = 19

Divide each side by '-1'.
x = -19

Simplifying
x = -19

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