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