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40=10n-n
We move all terms to the left:
40-(10n-n)=0
We add all the numbers together, and all the variables
-(+9n)+40=0
We get rid of parentheses
-9n+40=0
We move all terms containing n to the left, all other terms to the right
-9n=-40
n=-40/-9
n=4+4/9
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