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-78=-6(y+7)
We move all terms to the left:
-78-(-6(y+7))=0
We calculate terms in parentheses: -(-6(y+7)), so:We get rid of parentheses
-6(y+7)
We multiply parentheses
-6y-42
Back to the equation:
-(-6y-42)
6y+42-78=0
We add all the numbers together, and all the variables
6y-36=0
We move all terms containing y to the left, all other terms to the right
6y=36
y=36/6
y=6
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