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7y+15-2y=7(y+3)
We move all terms to the left:
7y+15-2y-(7(y+3))=0
We add all the numbers together, and all the variables
5y-(7(y+3))+15=0
We calculate terms in parentheses: -(7(y+3)), so:We get rid of parentheses
7(y+3)
We multiply parentheses
7y+21
Back to the equation:
-(7y+21)
5y-7y-21+15=0
We add all the numbers together, and all the variables
-2y-6=0
We move all terms containing y to the left, all other terms to the right
-2y=6
y=6/-2
y=-3
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