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2(9+y)=4(2y+1)-(7-y)
We move all terms to the left:
2(9+y)-(4(2y+1)-(7-y))=0
We add all the numbers together, and all the variables
2(y+9)-(4(2y+1)-(-1y+7))=0
We multiply parentheses
2y-(4(2y+1)-(-1y+7))+18=0
We calculate terms in parentheses: -(4(2y+1)-(-1y+7)), so:We get rid of parentheses
4(2y+1)-(-1y+7)
We multiply parentheses
8y-(-1y+7)+4
We get rid of parentheses
8y+1y-7+4
We add all the numbers together, and all the variables
9y-3
Back to the equation:
-(9y-3)
2y-9y+3+18=0
We add all the numbers together, and all the variables
-7y+21=0
We move all terms containing y to the left, all other terms to the right
-7y=-21
y=-21/-7
y=+3
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