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