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6y-30=y+15
We move all terms to the left:
6y-30-(y+15)=0
We get rid of parentheses
6y-y-15-30=0
We add all the numbers together, and all the variables
5y-45=0
We move all terms containing y to the left, all other terms to the right
5y=45
y=45/5
y=9
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