18-3(y+6)=21

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Solution for 18-3(y+6)=21 equation: 



18-3(y+6)=21

We move all terms to the left:

18-3(y+6)-(21)=0

We add all the numbers together, and all the variables

-3(y+6)-3=0

We multiply parentheses

-3y-18-3=0

We add all the numbers together, and all the variables

-3y-21=0

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

-3y=21

y=21/-3

y=-7

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