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-4=4y-16+8y
We move all terms to the left:
-4-(4y-16+8y)=0
We add all the numbers together, and all the variables
-(12y-16)-4=0
We get rid of parentheses
-12y+16-4=0
We add all the numbers together, and all the variables
-12y+12=0
We move all terms containing y to the left, all other terms to the right
-12y=-12
y=-12/-12
y=1
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