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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/5-(1/x) = 3*x+4/15 // - 3*x+4/15
x/5-(3*x)-(1/x)-(4/15) = 0
x/5-3*x-x^-1-4/15 = 0
-14/5*x^1-1*x^-1-4/15*x^0 = 0
(-14/5*x^2-4/15*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(-14/5*x^2-4/15*x^1-1*x^0) = 0
x^1
(-14/5)*x^2+(-4/15)*x-1 = 0
(-14/5)*x^2+(-4/15)*x-1 = 0
DELTA = (-4/15)^2-(-1*4*(-14/5))
DELTA = -2504/225
DELTA < 0
x in { }
x belongs to the empty set
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