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20n=18n-10
We move all terms to the left:
20n-(18n-10)=0
We get rid of parentheses
20n-18n+10=0
We add all the numbers together, and all the variables
2n+10=0
We move all terms containing n to the left, all other terms to the right
2n=-10
n=-10/2
n=-5
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