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9y+3=7y+15
We move all terms to the left:
9y+3-(7y+15)=0
We get rid of parentheses
9y-7y-15+3=0
We add all the numbers together, and all the variables
2y-12=0
We move all terms containing y to the left, all other terms to the right
2y=12
y=12/2
y=6
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