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-7y-4=-4y+17
We move all terms to the left:
-7y-4-(-4y+17)=0
We get rid of parentheses
-7y+4y-17-4=0
We add all the numbers together, and all the variables
-3y-21=0
We move all terms containing y to the left, all other terms to the right
-3y=21
y=21/-3
y=-7
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