100-.20=x

Solution for 100-.20=x equation:

Simplifying
100 + -0.20 = x

Combine like terms: 100 + -0.20 = 99.8
99.8 = x

Solving
99.8 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
99.8 + -1x = x + -1x

Combine like terms: x + -1x = 0
99.8 + -1x = 0

Add '-99.8' to each side of the equation.
99.8 + -99.8 + -1x = 0 + -99.8

Combine like terms: 99.8 + -99.8 = 0.0
0.0 + -1x = 0 + -99.8
-1x = 0 + -99.8

Combine like terms: 0 + -99.8 = -99.8
-1x = -99.8

Divide each side by '-1'.
x = 99.8

Simplifying
x = 99.8