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