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-20n=19n+12
We move all terms to the left:
-20n-(19n+12)=0
We get rid of parentheses
-20n-19n-12=0
We add all the numbers together, and all the variables
-39n-12=0
We move all terms containing n to the left, all other terms to the right
-39n=12
n=12/-39
n=-4/13
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