81=-x+100

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Solution for 81=-x+100 equation:


Simplifying
81 = -1x + 100

Reorder the terms:
81 = 100 + -1x

Solving
81 = 100 + -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.
81 + x = 100 + -1x + x

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

Add '-81' to each side of the equation.
81 + -81 + x = 100 + -81

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

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

Simplifying
x = 19

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