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39+y=4(3+y)
We move all terms to the left:
39+y-(4(3+y))=0
We add all the numbers together, and all the variables
y-(4(y+3))+39=0
We calculate terms in parentheses: -(4(y+3)), so:We get rid of parentheses
4(y+3)
We multiply parentheses
4y+12
Back to the equation:
-(4y+12)
y-4y-12+39=0
We add all the numbers together, and all the variables
-3y+27=0
We move all terms containing y to the left, all other terms to the right
-3y=-27
y=-27/-3
y=+9
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