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4y-15=-2(y+9)
We move all terms to the left:
4y-15-(-2(y+9))=0
We calculate terms in parentheses: -(-2(y+9)), so:We get rid of parentheses
-2(y+9)
We multiply parentheses
-2y-18
Back to the equation:
-(-2y-18)
4y+2y+18-15=0
We add all the numbers together, and all the variables
6y+3=0
We move all terms containing y to the left, all other terms to the right
6y=-3
y=-3/6
y=-1/2
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