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0=-15-3n
We move all terms to the left:
0-(-15-3n)=0
We add all the numbers together, and all the variables
-(-3n-15)+0=0
We add all the numbers together, and all the variables
-(-3n-15)=0
We get rid of parentheses
3n+15=0
We move all terms containing n to the left, all other terms to the right
3n=-15
n=-15/3
n=-5
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