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-18n-19=-20n+13
We move all terms to the left:
-18n-19-(-20n+13)=0
We get rid of parentheses
-18n+20n-13-19=0
We add all the numbers together, and all the variables
2n-32=0
We move all terms containing n to the left, all other terms to the right
2n=32
n=32/2
n=16
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