X*(x-1)/2=66

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Solution for X*(x-1)/2=66 equation: 


x in (-oo:+oo)

(X*(x-1))/2 = 66 // - 66

(X*(x-1))/2-66 = 0

(X*(x-1))/2+(-66*2)/2 = 0

X*(x-1)-66*2 = 0

X*x-X-132 = 0

(X*x-X-132)/2 = 0

(X*x-X-132)/2 = 0 // * 2

X*x-X-132 = 0

X*x-X-132 = 0 // + -X-132

X*x = -(-X-132) // : X

x = (-(-X-132))/X

x = (X+132)/X

x = (X+132)/X

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