3(y+3)-6y=21

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Solution for 3(y+3)-6y=21 equation: 



3(y+3)-6y=21

We move all terms to the left:

3(y+3)-6y-(21)=0

We add all the numbers together, and all the variables

-6y+3(y+3)-21=0

We multiply parentheses

-6y+3y+9-21=0

We add all the numbers together, and all the variables

-3y-12=0

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

-3y=12

y=12/-3

y=-4

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