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-15=-4n+9
We move all terms to the left:
-15-(-4n+9)=0
We get rid of parentheses
4n-9-15=0
We add all the numbers together, and all the variables
4n-24=0
We move all terms containing n to the left, all other terms to the right
4n=24
n=24/4
n=6
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