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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*(x-13))/15+4*x-(4/x)-(3/5) = 0
(2*(x-13))/15+4*x-4*x^-1-3/5 = 0
(2*(x-13))/15+4*x-4/x-3/5 = 0
(2*5*x*(x-13))/(5*15*x)+(4*5*15*x*x)/(5*15*x)+(-4*5*15)/(5*15*x)+(-3*15*x)/(5*15*x) = 0
2*5*x*(x-13)+4*5*15*x*x-3*15*x-4*5*15 = 0
310*x^2-130*x-45*x-300 = 0
310*x^2-175*x-300 = 0
310*x^2-175*x-300 = 0
5*(62*x^2-35*x-60) = 0
62*x^2-35*x-60 = 0
DELTA = (-35)^2-(-60*4*62)
DELTA = 16105
DELTA > 0
x = (16105^(1/2)+35)/(2*62) or x = (35-16105^(1/2))/(2*62)
x = (16105^(1/2)+35)/124 or x = (35-16105^(1/2))/124
5*(x-((35-16105^(1/2))/124))*(x-((16105^(1/2)+35)/124)) = 0
(5*(x-((35-16105^(1/2))/124))*(x-((16105^(1/2)+35)/124)))/(5*15*x) = 0
(5*(x-((35-16105^(1/2))/124))*(x-((16105^(1/2)+35)/124)))/(5*15*x) = 0 // * 5*15*x
5*(x-((35-16105^(1/2))/124))*(x-((16105^(1/2)+35)/124)) = 0
( x-((16105^(1/2)+35)/124) )
x-((16105^(1/2)+35)/124) = 0 // + (16105^(1/2)+35)/124
x = (16105^(1/2)+35)/124
( x-((35-16105^(1/2))/124) )
x-((35-16105^(1/2))/124) = 0 // + (35-16105^(1/2))/124
x = (35-16105^(1/2))/124
x in { (16105^(1/2)+35)/124, (35-16105^(1/2))/124 }
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