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-15=y/2(-3)
We move all terms to the left:
-15-(y/2(-3))=0
We multiply all the terms by the denominator
-(y-15*2(-3))=0
We calculate terms in parentheses: -(y-15*2(-3)), so:We get rid of parentheses
y-15*2(-3)
We add all the numbers together, and all the variables
y+90
Back to the equation:
-(y+90)
-y-90=0
We add all the numbers together, and all the variables
-1y-90=0
We move all terms containing y to the left, all other terms to the right
-y=90
y=90/-1
y=-90
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