(100-x)=20

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Solution for (100-x)=20 equation: 


Simplifying
(100 + -1x) = 20

Remove parenthesis around (100 + -1x)
100 + -1x = 20

Solving
100 + -1x = 20

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + -1x = 20 + -100

Combine like terms: 100 + -100 = 0
0 + -1x = 20 + -100
-1x = 20 + -100

Combine like terms: 20 + -100 = -80
-1x = -80

Divide each side by '-1'.
x = 80

Simplifying
x = 80

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