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186=85-y
We move all terms to the left:
186-(85-y)=0
We add all the numbers together, and all the variables
-(-1y+85)+186=0
We get rid of parentheses
1y-85+186=0
We add all the numbers together, and all the variables
y+101=0
We move all terms containing y to the left, all other terms to the right
y=-101
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