3(7+3y)+3y=9

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Solution for 3(7+3y)+3y=9 equation: 



3(7+3y)+3y=9

We move all terms to the left:

3(7+3y)+3y-(9)=0

We add all the numbers together, and all the variables

3(3y+7)+3y-9=0

We add all the numbers together, and all the variables

3y+3(3y+7)-9=0

We multiply parentheses

3y+9y+21-9=0

We add all the numbers together, and all the variables

12y+12=0

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

12y=-12

y=-12/12

y=-1

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