100-2x=80

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Solution for 100-2x=80 equation: 


Simplifying
100 + -2x = 80

Solving
100 + -2x = 80

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 + -2x = 80 + -100

Combine like terms: 100 + -100 = 0
0 + -2x = 80 + -100
-2x = 80 + -100

Combine like terms: 80 + -100 = -20
-2x = -20

Divide each side by '-2'.
x = 10

Simplifying
x = 10

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