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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x = 80*((x^-1)/3) // - 80*((x^-1)/3)
5*x-(80*((x^-1)/3)) = 0
5*x+(-80/3)*x^-1 = 0
5*x^1-80/3*x^-1 = 0
(5*x^2-80/3*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-80/3*x^0) = 0
x^1
5*x^2-80/3 = 0
5*x^2-80/3 = 0
DELTA = 0^2-(4*5*(-80/3))
DELTA = 1600/3
DELTA > 0
x = ((1600/3)^(1/2)+0)/(2*5) or x = (0-(1600/3)^(1/2))/(2*5)
x = ((1600/3)^(1/2))/10 or x = (-(1600/3)^(1/2))/10
x in { (-(1600/3)^(1/2))/10, ((1600/3)^(1/2))/10}
x in { (-(1600/3)^(1/2))/10, ((1600/3)^(1/2))/10 }
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