-20(20+-x)=100

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


Simplifying
-20(20 + -1x) = 100
(20 * -20 + -1x * -20) = 100
(-400 + 20x) = 100

Solving
-400 + 20x = 100

Solving for variable 'x'.

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

Add '400' to each side of the equation.
-400 + 400 + 20x = 100 + 400

Combine like terms: -400 + 400 = 0
0 + 20x = 100 + 400
20x = 100 + 400

Combine like terms: 100 + 400 = 500
20x = 500

Divide each side by '20'.
x = 25

Simplifying
x = 25

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