d=(6/d)-1

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Solution for d=(6/d)-1 equation: 


D( d )

d = 0

d = 0

d = 0

d in (-oo:0) U (0:+oo)

d = 6/d-1 // - 6/d-1

d-(6/d)+1 = 0

d-6*d^-1+1 = 0

1*d^1-6*d^-1+1*d^0 = 0

(1*d^2+1*d^1-6*d^0)/(d^1) = 0 // * d^2

d^1*(1*d^2+1*d^1-6*d^0) = 0

d^1

d^2+d-6 = 0

d^2+d-6 = 0

DELTA = 1^2-(-6*1*4)

DELTA = 25

DELTA > 0

d = (25^(1/2)-1)/(1*2) or d = (-25^(1/2)-1)/(1*2)

d = 2 or d = -3

d in { -3, 2} 

d in { -3, 2 }

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