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-15=-18+3y
We move all terms to the left:
-15-(-18+3y)=0
We add all the numbers together, and all the variables
-(3y-18)-15=0
We get rid of parentheses
-3y+18-15=0
We add all the numbers together, and all the variables
-3y+3=0
We move all terms containing y to the left, all other terms to the right
-3y=-3
y=-3/-3
y=1
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