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