100=y-20

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Solution for 100=y-20 equation: 



100=y-20

We move all terms to the left:

100-(y-20)=0

We get rid of parentheses

-y+20+100=0

We add all the numbers together, and all the variables

-1y+120=0

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

-y=-120

y=-120/-1

y=+120

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