-7y-9=8y+21

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Solution for -7y-9=8y+21 equation: 



-7y-9=8y+21

We move all terms to the left:

-7y-9-(8y+21)=0

We get rid of parentheses

-7y-8y-21-9=0

We add all the numbers together, and all the variables

-15y-30=0

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

-15y=30

y=30/-15

y=-2

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