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141=270-y
We move all terms to the left:
141-(270-y)=0
We add all the numbers together, and all the variables
-(-1y+270)+141=0
We get rid of parentheses
1y-270+141=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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