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153=251-y
We move all terms to the left:
153-(251-y)=0
We add all the numbers together, and all the variables
-(-1y+251)+153=0
We get rid of parentheses
1y-251+153=0
We add all the numbers together, and all the variables
y-98=0
We move all terms containing y to the left, all other terms to the right
y=98
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