-3y-12=8y+21

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Solution for -3y-12=8y+21 equation: 



-3y-12=8y+21

We move all terms to the left:

-3y-12-(8y+21)=0

We get rid of parentheses

-3y-8y-21-12=0

We add all the numbers together, and all the variables

-11y-33=0

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

-11y=33

y=33/-11

y=-3

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