-80=-100+y

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Solution for -80=-100+y equation: 



-80=-100+y

We move all terms to the left:

-80-(-100+y)=0

We add all the numbers together, and all the variables

-(y-100)-80=0

We get rid of parentheses

-y+100-80=0

We add all the numbers together, and all the variables

-1y+20=0

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

-y=-20

y=-20/-1

y=+20

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