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-5y-9=-(y-1)
We move all terms to the left:
-5y-9-(-(y-1))=0
We calculate terms in parentheses: -(-(y-1)), so:We get rid of parentheses
-(y-1)
We get rid of parentheses
-y+1
We add all the numbers together, and all the variables
-1y+1
Back to the equation:
-(-1y+1)
-5y+1y-1-9=0
We add all the numbers together, and all the variables
-4y-10=0
We move all terms containing y to the left, all other terms to the right
-4y=10
y=10/-4
y=-2+1/2
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