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-y+4=-2y+8
We move all terms to the left:
-y+4-(-2y+8)=0
We add all the numbers together, and all the variables
-1y-(-2y+8)+4=0
We get rid of parentheses
-1y+2y-8+4=0
We add all the numbers together, and all the variables
y-4=0
We move all terms containing y to the left, all other terms to the right
y=4
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