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3y-42=-3(y-4)
We move all terms to the left:
3y-42-(-3(y-4))=0
We calculate terms in parentheses: -(-3(y-4)), so:We get rid of parentheses
-3(y-4)
We multiply parentheses
-3y+12
Back to the equation:
-(-3y+12)
3y+3y-12-42=0
We add all the numbers together, and all the variables
6y-54=0
We move all terms containing y to the left, all other terms to the right
6y=54
y=54/6
y=9
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