-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+28=0

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

-2y=-28

y=-28/-2

y=+14

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