-y+7=y+21

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Solution for -y+7=y+21 equation: 



-y+7=y+21

We move all terms to the left:

-y+7-(y+21)=0

We add all the numbers together, and all the variables

-1y-(y+21)+7=0

We get rid of parentheses

-1y-y-21+7=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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