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42=-7(y+49)
We move all terms to the left:
42-(-7(y+49))=0
We calculate terms in parentheses: -(-7(y+49)), so:We get rid of parentheses
-7(y+49)
We multiply parentheses
-7y-343
Back to the equation:
-(-7y-343)
7y+343+42=0
We add all the numbers together, and all the variables
7y+385=0
We move all terms containing y to the left, all other terms to the right
7y=-385
y=-385/7
y=-55
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