3(-5y+2)=21.

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Solution for 3(-5y+2)=21. equation: 



3(-5y+2)=21.

We move all terms to the left:

3(-5y+2)-(21.)=0

We add all the numbers together, and all the variables

3(-5y+2)-21=0

We multiply parentheses

-15y+6-21=0

We add all the numbers together, and all the variables

-15y-15=0

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

-15y=15

y=15/-15

y=-1

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