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

-1y+30=0

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

-y=-30

y=-30/-1

y=+30

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