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