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-9y-8=128+8y
We move all terms to the left:
-9y-8-(128+8y)=0
We add all the numbers together, and all the variables
-9y-(8y+128)-8=0
We get rid of parentheses
-9y-8y-128-8=0
We add all the numbers together, and all the variables
-17y-136=0
We move all terms containing y to the left, all other terms to the right
-17y=136
y=136/-17
y=-8
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