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3(y+12)-6(y+1)=-9
We move all terms to the left:
3(y+12)-6(y+1)-(-9)=0
We add all the numbers together, and all the variables
3(y+12)-6(y+1)+9=0
We multiply parentheses
3y-6y+36-6+9=0
We add all the numbers together, and all the variables
-3y+39=0
We move all terms containing y to the left, all other terms to the right
-3y=-39
y=-39/-3
y=+13
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