-80=-100+x

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Solution for -80=-100+x equation: 



-80=-100+x

We move all terms to the left:

-80-(-100+x)=0

We add all the numbers together, and all the variables

-(x-100)-80=0

We get rid of parentheses

-x+100-80=0

We add all the numbers together, and all the variables

-1x+20=0

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

-x=-20

x=-20/-1

x=+20

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