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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-7/x = (-10/3)*x-3 // - (-10/3)*x-3
3-((-10/3)*x)-7/x = 0
(10/3)*x-7/x+3 = 0
10/3*x^1-7*x^-1+3*x^0 = 0
(10/3*x^2+3*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(10/3*x^2+3*x^1-7*x^0) = 0
x^1
(10/3)*x^2+3*x-7 = 0
(10/3)*x^2+3*x-7 = 0
DELTA = 3^2-(-7*4*(10/3))
DELTA = 307/3
DELTA > 0
x = ((307/3)^(1/2)-3)/(2*(10/3)) or x = (-(307/3)^(1/2)-3)/(2*(10/3))
x = 3/20*((307/3)^(1/2)-3) or x = -3/20*((307/3)^(1/2)+3)
x in { -3/20*((307/3)^(1/2)+3), 3/20*((307/3)^(1/2)-3)}
x in { -3/20*((307/3)^(1/2)+3), 3/20*((307/3)^(1/2)-3) }
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