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-5-2n=-4n+9
We move all terms to the left:
-5-2n-(-4n+9)=0
We get rid of parentheses
-2n+4n-9-5=0
We add all the numbers together, and all the variables
2n-14=0
We move all terms containing n to the left, all other terms to the right
2n=14
n=14/2
n=7
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