-3(4y+-3)=21

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Solution for -3(4y+-3)=21 equation: 



-3(4y+-3)=21

We move all terms to the left:

-3(4y+-3)-(21)=0

We add all the numbers together, and all the variables

-3(4y-3)-21=0

We multiply parentheses

-12y+9-21=0

We add all the numbers together, and all the variables

-12y-12=0

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

-12y=12

y=12/-12

y=-1

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