100=-2x+20

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Solution for 100=-2x+20 equation: 



100=-2x+20

We move all terms to the left:

100-(-2x+20)=0

We get rid of parentheses

2x-20+100=0

We add all the numbers together, and all the variables

2x+80=0

We move all terms containing x to the left, all other terms to the right

2x=-80

x=-80/2

x=-40

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