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40=2n+18
We move all terms to the left:
40-(2n+18)=0
We get rid of parentheses
-2n-18+40=0
We add all the numbers together, and all the variables
-2n+22=0
We move all terms containing n to the left, all other terms to the right
-2n=-22
n=-22/-2
n=+11
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