21=y-7

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Solution for 21=y-7 equation: 



21=y-7

We move all terms to the left:

21-(y-7)=0

We get rid of parentheses

-y+7+21=0

We add all the numbers together, and all the variables

-1y+28=0

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

-y=-28

y=-28/-1

y=+28

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