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48=18n+6n
We move all terms to the left:
48-(18n+6n)=0
We add all the numbers together, and all the variables
-(+24n)+48=0
We get rid of parentheses
-24n+48=0
We move all terms containing n to the left, all other terms to the right
-24n=-48
n=-48/-24
n=+2
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