C(n,2)=55

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Solution for C(n,2)=55 equation: 



(C.2)=55

We move all terms to the left:

(C.2)-(55)=0

We add all the numbers together, and all the variables

(+C.2)-55=0

We get rid of parentheses

C.2-55=0

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

C.2=55

C=55/1

C=55

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