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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/9)*x+36 = 5/x-(2/9)+4 // - 5/x-(2/9)+4
(7/9)*x-(5/x)+2/9-4+36 = 0
(7/9)*x-5*x^-1+2/9-4+36 = 0
7/9*x^1-5*x^-1+290/9*x^0 = 0
(7/9*x^2+290/9*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(7/9*x^2+290/9*x^1-5*x^0) = 0
x^1
(7/9)*x^2+(290/9)*x-5 = 0
(7/9)*x^2+(290/9)*x-5 = 0
DELTA = (290/9)^2-(-5*4*(7/9))
DELTA = 85360/81
DELTA > 0
x = ((85360/81)^(1/2)-(290/9))/(2*(7/9)) or x = (-(290/9)-(85360/81)^(1/2))/(2*(7/9))
x = 9/14*((85360/81)^(1/2)-290/9) or x = -9/14*((85360/81)^(1/2)+290/9)
x in { -9/14*((85360/81)^(1/2)+290/9), 9/14*((85360/81)^(1/2)-290/9)}
x in { -9/14*((85360/81)^(1/2)+290/9), 9/14*((85360/81)^(1/2)-290/9) }
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