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40-5y=-(y-4)
We move all terms to the left:
40-5y-(-(y-4))=0
We calculate terms in parentheses: -(-(y-4)), so:We get rid of parentheses
-(y-4)
We get rid of parentheses
-y+4
We add all the numbers together, and all the variables
-1y+4
Back to the equation:
-(-1y+4)
-5y+1y-4+40=0
We add all the numbers together, and all the variables
-4y+36=0
We move all terms containing y to the left, all other terms to the right
-4y=-36
y=-36/-4
y=+9
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