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7(y-7)=2(13+y)
We move all terms to the left:
7(y-7)-(2(13+y))=0
We add all the numbers together, and all the variables
7(y-7)-(2(y+13))=0
We multiply parentheses
7y-(2(y+13))-49=0
We calculate terms in parentheses: -(2(y+13)), so:We get rid of parentheses
2(y+13)
We multiply parentheses
2y+26
Back to the equation:
-(2y+26)
7y-2y-26-49=0
We add all the numbers together, and all the variables
5y-75=0
We move all terms containing y to the left, all other terms to the right
5y=75
y=75/5
y=15
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