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-8(+4)=-9Y
We move all terms to the left:
-8(+4)-(-9Y)=0
We add all the numbers together, and all the variables
-(-9Y)-84=0
We get rid of parentheses
9Y-84=0
We move all terms containing Y to the left, all other terms to the right
9Y=84
Y=84/9
Y=9+1/3
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