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206=77-y
We move all terms to the left:
206-(77-y)=0
We add all the numbers together, and all the variables
-(-1y+77)+206=0
We get rid of parentheses
1y-77+206=0
We add all the numbers together, and all the variables
y+129=0
We move all terms containing y to the left, all other terms to the right
y=-129
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