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23=2+3n+4n
We move all terms to the left:
23-(2+3n+4n)=0
We add all the numbers together, and all the variables
-(7n+2)+23=0
We get rid of parentheses
-7n-2+23=0
We add all the numbers together, and all the variables
-7n+21=0
We move all terms containing n to the left, all other terms to the right
-7n=-21
n=-21/-7
n=+3
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