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212=289-y
We move all terms to the left:
212-(289-y)=0
We add all the numbers together, and all the variables
-(-1y+289)+212=0
We get rid of parentheses
1y-289+212=0
We add all the numbers together, and all the variables
y-77=0
We move all terms containing y to the left, all other terms to the right
y=77
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