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