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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/3 = 7-4/x // - 7-4/x
x/3-(-4/x)-7 = 0
x/3+4*x^-1-7 = 0
1/3*x^1+4*x^-1-7*x^0 = 0
(1/3*x^2-7*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2-7*x^1+4*x^0) = 0
x^1
(1/3)*x^2-7*x+4 = 0
(1/3)*x^2-7*x+4 = 0
DELTA = (-7)^2-(4*4*(1/3))
DELTA = 131/3
DELTA > 0
x = ((131/3)^(1/2)+7)/(2*(1/3)) or x = (7-(131/3)^(1/2))/(2*(1/3))
x = 3/2*((131/3)^(1/2)+7) or x = 3/2*(7-(131/3)^(1/2))
x in { 3/2*(7-(131/3)^(1/2)), 3/2*((131/3)^(1/2)+7)}
x in { 3/2*(7-(131/3)^(1/2)), 3/2*((131/3)^(1/2)+7) }
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