3(3+y)=21

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



3(3+y)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(y+3)-21=0

We multiply parentheses

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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