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(-0.5y+20-0.5y=13)
We move all terms to the left:
(-0.5y+20-0.5y-(13))=0
We add all the numbers together, and all the variables
(-1y+7)=0
We get rid of parentheses
-1y+7=0
We move all terms containing y to the left, all other terms to the right
-y=-7
y=-7/-1
y=+7
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