-21=2y-7

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Solution for -21=2y-7 equation: 



-21=2y-7

We move all terms to the left:

-21-(2y-7)=0

We get rid of parentheses

-2y+7-21=0

We add all the numbers together, and all the variables

-2y-14=0

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

-2y=14

y=14/-2

y=-7

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