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