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-9n-7=-4n+8
We move all terms to the left:
-9n-7-(-4n+8)=0
We get rid of parentheses
-9n+4n-8-7=0
We add all the numbers together, and all the variables
-5n-15=0
We move all terms containing n to the left, all other terms to the right
-5n=15
n=15/-5
n=-3
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