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255=-y+166
We move all terms to the left:
255-(-y+166)=0
We add all the numbers together, and all the variables
-(-1y+166)+255=0
We get rid of parentheses
1y-166+255=0
We add all the numbers together, and all the variables
y+89=0
We move all terms containing y to the left, all other terms to the right
y=-89
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