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15=3n+2
We move all terms to the left:
15-(3n+2)=0
We get rid of parentheses
-3n-2+15=0
We add all the numbers together, and all the variables
-3n+13=0
We move all terms containing n to the left, all other terms to the right
-3n=-13
n=-13/-3
n=4+1/3
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