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