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20=8(y-8)+4y
We move all terms to the left:
20-(8(y-8)+4y)=0
We calculate terms in parentheses: -(8(y-8)+4y), so:We get rid of parentheses
8(y-8)+4y
We add all the numbers together, and all the variables
4y+8(y-8)
We multiply parentheses
4y+8y-64
We add all the numbers together, and all the variables
12y-64
Back to the equation:
-(12y-64)
-12y+64+20=0
We add all the numbers together, and all the variables
-12y+84=0
We move all terms containing y to the left, all other terms to the right
-12y=-84
y=-84/-12
y=+7
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