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4n-40=-14n
We move all terms to the left:
4n-40-(-14n)=0
We get rid of parentheses
4n+14n-40=0
We add all the numbers together, and all the variables
18n-40=0
We move all terms containing n to the left, all other terms to the right
18n=40
n=40/18
n=2+2/9
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