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168=225-y
We move all terms to the left:
168-(225-y)=0
We add all the numbers together, and all the variables
-(-1y+225)+168=0
We get rid of parentheses
1y-225+168=0
We add all the numbers together, and all the variables
y-57=0
We move all terms containing y to the left, all other terms to the right
y=57
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