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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(x^2)-((4/5)*x)-((45/9)*x)+18 = 0
(-4/5)*x-5*x+(2*x)/(x^2)+18 = 0
2*x^-1-29/5*x^1+18*x^0 = 0
(18*x^1-29/5*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(18*x^1-29/5*x^2+2*x^0) = 0
x^1
(-29/5)*x^2+18*x+2 = 0
(-29/5)*x^2+18*x+2 = 0
DELTA = 18^2-(2*4*(-29/5))
DELTA = 1852/5
DELTA > 0
x = ((1852/5)^(1/2)-18)/(2*(-29/5)) or x = (-(1852/5)^(1/2)-18)/(2*(-29/5))
x = -5/58*((1852/5)^(1/2)-18) or x = 5/58*((1852/5)^(1/2)+18)
x in { -5/58*((1852/5)^(1/2)-18), 5/58*((1852/5)^(1/2)+18)}
x in { -5/58*((1852/5)^(1/2)-18), 5/58*((1852/5)^(1/2)+18) }
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