3(2y+21)=21

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



3(2y+21)=21

We move all terms to the left:

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

We multiply parentheses

6y+63-21=0

We add all the numbers together, and all the variables

6y+42=0

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

6y=-42

y=-42/6

y=-7

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