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12y+9=18y+5
We move all terms to the left:
12y+9-(18y+5)=0
We get rid of parentheses
12y-18y-5+9=0
We add all the numbers together, and all the variables
-6y+4=0
We move all terms containing y to the left, all other terms to the right
-6y=-4
y=-4/-6
y=2/3
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