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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = x-(3/5) // - x-(3/5)
14/x-x+3/5 = 0
14*x^-1-1*x^1+3/5*x^0 = 0
(3/5*x^1-1*x^2+14*x^0)/(x^1) = 0 // * x^2
x^1*(3/5*x^1-1*x^2+14*x^0) = 0
x^1
(3/5)*x-x^2+14 = 0
(3/5)*x-x^2+14 = 0
DELTA = (3/5)^2-(-1*4*14)
DELTA = 1409/25
DELTA > 0
x = ((1409/25)^(1/2)-(3/5))/(-1*2) or x = (-(3/5)-(1409/25)^(1/2))/(-1*2)
x = ((1409/25)^(1/2)-3/5)/(-2) or x = ((1409/25)^(1/2)+3/5)/2
x in { ((1409/25)^(1/2)-3/5)/(-2), ((1409/25)^(1/2)+3/5)/2}
x in { ((1409/25)^(1/2)-3/5)/(-2), ((1409/25)^(1/2)+3/5)/2 }
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