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-7y+42=-5(y-8)
We move all terms to the left:
-7y+42-(-5(y-8))=0
We calculate terms in parentheses: -(-5(y-8)), so:We get rid of parentheses
-5(y-8)
We multiply parentheses
-5y+40
Back to the equation:
-(-5y+40)
-7y+5y-40+42=0
We add all the numbers together, and all the variables
-2y+2=0
We move all terms containing y to the left, all other terms to the right
-2y=-2
y=-2/-2
y=1
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