(100-x)+(40-0.5x)=20

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Solution for (100-x)+(40-0.5x)=20 equation:


Simplifying
(100 + -1x) + (40 + -0.5x) = 20

Remove parenthesis around (100 + -1x)
100 + -1x + (40 + -0.5x) = 20

Remove parenthesis around (40 + -0.5x)
100 + -1x + 40 + -0.5x = 20

Reorder the terms:
100 + 40 + -1x + -0.5x = 20

Combine like terms: 100 + 40 = 140
140 + -1x + -0.5x = 20

Combine like terms: -1x + -0.5x = -1.5x
140 + -1.5x = 20

Solving
140 + -1.5x = 20

Solving for variable 'x'.

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

Add '-140' to each side of the equation.
140 + -140 + -1.5x = 20 + -140

Combine like terms: 140 + -140 = 0
0 + -1.5x = 20 + -140
-1.5x = 20 + -140

Combine like terms: 20 + -140 = -120
-1.5x = -120

Divide each side by '-1.5'.
x = 80

Simplifying
x = 80

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