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222=42-y
We move all terms to the left:
222-(42-y)=0
We add all the numbers together, and all the variables
-(-1y+42)+222=0
We get rid of parentheses
1y-42+222=0
We add all the numbers together, and all the variables
y+180=0
We move all terms containing y to the left, all other terms to the right
y=-180
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