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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/7)*x-5 = 13/x // - 13/x
(6/7)*x-(13/x)-5 = 0
(6/7)*x-13*x^-1-5 = 0
6/7*x^1-13*x^-1-5*x^0 = 0
(6/7*x^2-5*x^1-13*x^0)/(x^1) = 0 // * x^2
x^1*(6/7*x^2-5*x^1-13*x^0) = 0
x^1
(6/7)*x^2-5*x-13 = 0
(6/7)*x^2-5*x-13 = 0
DELTA = (-5)^2-(-13*4*(6/7))
DELTA = 487/7
DELTA > 0
x = ((487/7)^(1/2)+5)/(2*(6/7)) or x = (5-(487/7)^(1/2))/(2*(6/7))
x = 7/12*((487/7)^(1/2)+5) or x = 7/12*(5-(487/7)^(1/2))
x in { 7/12*(5-(487/7)^(1/2)), 7/12*((487/7)^(1/2)+5)}
x in { 7/12*(5-(487/7)^(1/2)), 7/12*((487/7)^(1/2)+5) }
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