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8+4n=-5n+9
We move all terms to the left:
8+4n-(-5n+9)=0
We get rid of parentheses
4n+5n-9+8=0
We add all the numbers together, and all the variables
9n-1=0
We move all terms containing n to the left, all other terms to the right
9n=1
n=1/9
n=1/9
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