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15y-9=51-15y
We move all terms to the left:
15y-9-(51-15y)=0
We add all the numbers together, and all the variables
15y-(-15y+51)-9=0
We get rid of parentheses
15y+15y-51-9=0
We add all the numbers together, and all the variables
30y-60=0
We move all terms containing y to the left, all other terms to the right
30y=60
y=60/30
y=2
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