100-2x=20-x

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Solution for 100-2x=20-x equation:


Simplifying
100 + -2x = 20 + -1x

Solving
100 + -2x = 20 + -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.
100 + -2x + x = 20 + -1x + x

Combine like terms: -2x + x = -1x
100 + -1x = 20 + -1x + x

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

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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