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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x = 19-(12/x) // - 19-(12/x)
5*x+12/x-19 = 0
5*x^1+12*x^-1-19*x^0 = 0
(5*x^2-19*x^1+12*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-19*x^1+12*x^0) = 0
x^1
5*x^2-19*x+12 = 0
5*x^2-19*x+12 = 0
DELTA = (-19)^2-(4*5*12)
DELTA = 121
DELTA > 0
x = (121^(1/2)+19)/(2*5) or x = (19-121^(1/2))/(2*5)
x = 3 or x = 4/5
x in { 4/5, 3}
x in { 4/5, 3 }
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