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-20-20n=18-18n
We move all terms to the left:
-20-20n-(18-18n)=0
We add all the numbers together, and all the variables
-20n-(-18n+18)-20=0
We get rid of parentheses
-20n+18n-18-20=0
We add all the numbers together, and all the variables
-2n-38=0
We move all terms containing n to the left, all other terms to the right
-2n=38
n=38/-2
n=-19
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