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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-5/3)*x+4/x-9-3 = 5/6 // - 5/6
(-5/3)*x+4/x-(5/6)-9-3 = 0
(-5/3)*x+4/x-5/6-9-3 = 0
4*x^-1-5/3*x^1-77/6*x^0 = 0
(4*x^0-5/3*x^2-77/6*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-5/3*x^2-77/6*x^1) = 0
x^1
(-5/3)*x^2+(-77/6)*x+4 = 0
(-5/3)*x^2+(-77/6)*x+4 = 0
DELTA = (-77/6)^2-(4*4*(-5/3))
DELTA = 6889/36
DELTA > 0
x = ((6889/36)^(1/2)-(-77/6))/(2*(-5/3)) or x = (-(-77/6)-(6889/36)^(1/2))/(2*(-5/3))
x = -8 or x = 3/10
x in { -8, 3/10}
x in { -8, 3/10 }
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