n+2Cn=9

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Solution for n+2Cn=9 equation: 



n+2n=9

We move all terms to the left:

n+2n-(9)=0

We add all the numbers together, and all the variables

3n-9=0

We move all terms containing n to the left, all other terms to the right

3n=9

n=9/3

n=3

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