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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3/5)/x)/3 = x-(11/15) // - x-(11/15)
((3/5)/x)/3-x+11/15 = 0
1/5*x^-1-1*x^1+11/15*x^0 = 0
(11/15*x^1-1*x^2+1/5*x^0)/(x^1) = 0 // * x^2
x^1*(11/15*x^1-1*x^2+1/5*x^0) = 0
x^1
(11/15)*x-x^2+1/5 = 0
(11/15)*x-x^2+1/5 = 0
DELTA = (11/15)^2-(-1*4*(1/5))
DELTA = 301/225
DELTA > 0
x = ((301/225)^(1/2)-(11/15))/(-1*2) or x = (-(11/15)-(301/225)^(1/2))/(-1*2)
x = ((301/225)^(1/2)-11/15)/(-2) or x = ((301/225)^(1/2)+11/15)/2
x in { ((301/225)^(1/2)-11/15)/(-2), ((301/225)^(1/2)+11/15)/2}
x in { ((301/225)^(1/2)-11/15)/(-2), ((301/225)^(1/2)+11/15)/2 }
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