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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/2 = 8/(3*x) // - 8/(3*x)
(3*x)/2-(8/(3*x)) = 0
(3*x)/2+(-8/3)*x^-1 = 0
3/2*x^1-8/3*x^-1 = 0
(3/2*x^2-8/3*x^0)/(x^1) = 0 // * x^2
x^1*(3/2*x^2-8/3*x^0) = 0
x^1
(3/2)*x^2-8/3 = 0
(3/2)*x^2-8/3 = 0
DELTA = 0^2-(4*(3/2)*(-8/3))
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(2*(3/2)) or x = (0-16^(1/2))/(2*(3/2))
x = 4/3 or x = -4/3
x in { -4/3, 4/3}
x in { -4/3, 4/3 }
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