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12y-4=9y-9
We move all terms to the left:
12y-4-(9y-9)=0
We get rid of parentheses
12y-9y+9-4=0
We add all the numbers together, and all the variables
3y+5=0
We move all terms containing y to the left, all other terms to the right
3y=-5
y=-5/3
y=-1+2/3
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