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-9-n/3=-15
We move all terms to the left:
-9-n/3-(-15)=0
We add all the numbers together, and all the variables
-n/3+6=0
We multiply all the terms by the denominator
-n+6*3=0
We add all the numbers together, and all the variables
-1n+18=0
We move all terms containing n to the left, all other terms to the right
-n=-18
n=-18/-1
n=+18
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