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12y-4=9-y
We move all terms to the left:
12y-4-(9-y)=0
We add all the numbers together, and all the variables
12y-(-1y+9)-4=0
We get rid of parentheses
12y+1y-9-4=0
We add all the numbers together, and all the variables
13y-13=0
We move all terms containing y to the left, all other terms to the right
13y=13
y=13/13
y=1
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