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48=103y-49-102y+7+42
We move all terms to the left:
48-(103y-49-102y+7+42)=0
We add all the numbers together, and all the variables
-(+y)+48=0
We get rid of parentheses
-y+48=0
We add all the numbers together, and all the variables
-1y+48=0
We move all terms containing y to the left, all other terms to the right
-y=-48
y=-48/-1
y=+48
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