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