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66=n+10+3n
We move all terms to the left:
66-(n+10+3n)=0
We add all the numbers together, and all the variables
-(4n+10)+66=0
We get rid of parentheses
-4n-10+66=0
We add all the numbers together, and all the variables
-4n+56=0
We move all terms containing n to the left, all other terms to the right
-4n=-56
n=-56/-4
n=+14
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