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204=15-y
We move all terms to the left:
204-(15-y)=0
We add all the numbers together, and all the variables
-(-1y+15)+204=0
We get rid of parentheses
1y-15+204=0
We add all the numbers together, and all the variables
y+189=0
We move all terms containing y to the left, all other terms to the right
y=-189
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