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(4n-5n)5=40
We move all terms to the left:
(4n-5n)5-(40)=0
We add all the numbers together, and all the variables
(-1n)5-40=0
We multiply parentheses
-5n-40=0
We move all terms containing n to the left, all other terms to the right
-5n=40
n=40/-5
n=-8
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