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12(y+3)-3y=117
We move all terms to the left:
12(y+3)-3y-(117)=0
We add all the numbers together, and all the variables
-3y+12(y+3)-117=0
We multiply parentheses
-3y+12y+36-117=0
We add all the numbers together, and all the variables
9y-81=0
We move all terms containing y to the left, all other terms to the right
9y=81
y=81/9
y=9
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