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7=-y+257
We move all terms to the left:
7-(-y+257)=0
We add all the numbers together, and all the variables
-(-1y+257)+7=0
We get rid of parentheses
1y-257+7=0
We add all the numbers together, and all the variables
y-250=0
We move all terms containing y to the left, all other terms to the right
y=250
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