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-9+2n=-4n+9+4n
We move all terms to the left:
-9+2n-(-4n+9+4n)=0
We add all the numbers together, and all the variables
2n-9-9=0
We add all the numbers together, and all the variables
2n-18=0
We move all terms containing n to the left, all other terms to the right
2n=18
n=18/2
n=9
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