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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+2 = x/3 // - x/3
5/x-(x/3)+2 = 0
5*x^-1-1/3*x^1+2*x^0 = 0
(2*x^1-1/3*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-1/3*x^2+5*x^0) = 0
x^1
(-1/3)*x^2+2*x+5 = 0
(-1/3)*x^2+2*x+5 = 0
DELTA = 2^2-(4*5*(-1/3))
DELTA = 32/3
DELTA > 0
x = ((32/3)^(1/2)-2)/(2*(-1/3)) or x = (-(32/3)^(1/2)-2)/(2*(-1/3))
x = -3/2*((32/3)^(1/2)-2) or x = 3/2*((32/3)^(1/2)+2)
x in { -3/2*((32/3)^(1/2)-2), 3/2*((32/3)^(1/2)+2)}
x in { -3/2*((32/3)^(1/2)-2), 3/2*((32/3)^(1/2)+2) }
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