20=100+2x

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Solution for 20=100+2x equation: 



20=100+2x

We move all terms to the left:

20-(100+2x)=0

We add all the numbers together, and all the variables

-(2x+100)+20=0

We get rid of parentheses

-2x-100+20=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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