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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+3 = 28/x // - 28/x
X-(28/x)+3 = 0
X-28*x^-1+3 = 0
-28*x^-1 = -(X+3) // : -28
x^-1 = (X+3)/28
-1 < 0
1/(x^1) = (X+3)/28 // * x^1
1 = x^1*((X+3)/28) // : (X+3)/28
28*(X+3)^-1 = x^1
x = 28*(X+3)^-1
x = 28*(X+3)^-1
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