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-4y-49=-7(y+4)
We move all terms to the left:
-4y-49-(-7(y+4))=0
We calculate terms in parentheses: -(-7(y+4)), so:We get rid of parentheses
-7(y+4)
We multiply parentheses
-7y-28
Back to the equation:
-(-7y-28)
-4y+7y+28-49=0
We add all the numbers together, and all the variables
3y-21=0
We move all terms containing y to the left, all other terms to the right
3y=21
y=21/3
y=7
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