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4=2+y
We move all terms to the left:
4-(2+y)=0
We add all the numbers together, and all the variables
-(y+2)+4=0
We get rid of parentheses
-y-2+4=0
We add all the numbers together, and all the variables
-1y+2=0
We move all terms containing y to the left, all other terms to the right
-y=-2
y=-2/-1
y=+2
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