9y+7=8y-21

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



9y+7=8y-21

We move all terms to the left:

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

We get rid of parentheses

9y-8y+21+7=0

We add all the numbers together, and all the variables

y+28=0

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

y=-28

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