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20n+59=10n+69
We move all terms to the left:
20n+59-(10n+69)=0
We get rid of parentheses
20n-10n-69+59=0
We add all the numbers together, and all the variables
10n-10=0
We move all terms containing n to the left, all other terms to the right
10n=10
n=10/10
n=1
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