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-5y+27=-3(y-7)
We move all terms to the left:
-5y+27-(-3(y-7))=0
We calculate terms in parentheses: -(-3(y-7)), so:We get rid of parentheses
-3(y-7)
We multiply parentheses
-3y+21
Back to the equation:
-(-3y+21)
-5y+3y-21+27=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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