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20-10n=5n-20
We move all terms to the left:
20-10n-(5n-20)=0
We get rid of parentheses
-10n-5n+20+20=0
We add all the numbers together, and all the variables
-15n+40=0
We move all terms containing n to the left, all other terms to the right
-15n=-40
n=-40/-15
n=2+2/3
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