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9=2y-15
We move all terms to the left:
9-(2y-15)=0
We get rid of parentheses
-2y+15+9=0
We add all the numbers together, and all the variables
-2y+24=0
We move all terms containing y to the left, all other terms to the right
-2y=-24
y=-24/-2
y=+12
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