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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = (18/5)*x+2 // - (18/5)*x+2
3/x-((18/5)*x)-2 = 0
(-18/5)*x+3/x-2 = 0
3*x^-1-18/5*x^1-2*x^0 = 0
(3*x^0-18/5*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-18/5*x^2-2*x^1) = 0
x^1
(-18/5)*x^2-2*x+3 = 0
(-18/5)*x^2-2*x+3 = 0
DELTA = (-2)^2-(3*4*(-18/5))
DELTA = 236/5
DELTA > 0
x = ((236/5)^(1/2)+2)/(2*(-18/5)) or x = (2-(236/5)^(1/2))/(2*(-18/5))
x = -5/36*((236/5)^(1/2)+2) or x = -5/36*(2-(236/5)^(1/2))
x in { -5/36*((236/5)^(1/2)+2), -5/36*(2-(236/5)^(1/2))}
x in { -5/36*((236/5)^(1/2)+2), -5/36*(2-(236/5)^(1/2)) }
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