C(n,3)=2C(n,4)

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Solution for C(n,3)=2C(n,4) equation: 



(C.3)=2(C.4)

We move all terms to the left:

(C.3)-(2(C.4))=0

We add all the numbers together, and all the variables

(+C.3)-(2(+C.4))=0

We get rid of parentheses

C.3-(2(+C.4))=0



We calculate terms in parentheses: -(2(+C.4)), so:

2(+C.4)

We multiply parentheses

2C

Back to the equation:

-(2C)



We add all the numbers together, and all the variables

-2C+C.3=0

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