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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-((3*a)/x) = 0
4-3*a*x^-1 = 0
-3*a*x^-1 = -4 // : -3*a
x^-1 = -4/(-3*a)
-1 < 0
1/(x^1) = -4/(-3*a) // * x^1
1 = (-4/(-3*a))*x^1 // : -4/(-3*a)
(3*a)/4 = x^1
x = (3*a)/4
x = (3*a)/4
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