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159=80-y
We move all terms to the left:
159-(80-y)=0
We add all the numbers together, and all the variables
-(-1y+80)+159=0
We get rid of parentheses
1y-80+159=0
We add all the numbers together, and all the variables
y+79=0
We move all terms containing y to the left, all other terms to the right
y=-79
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