n2=n*(n-1)/2

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Solution for n2=n*(n-1)/2 equation: 



n2=n(n-1)/2

We move all terms to the left:

n2-(n(n-1)/2)=0

We add all the numbers together, and all the variables

n^2-(n(n-1)/2)=0

We multiply all the terms by the denominator


n^2*2)-(n(n-1)=0

Wy multiply elements

2n^3=0

We do not support enpression: n^3

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