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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9-(4/x) = 58 // - 58
9-(4/x)-58 = 0
9-4*x^-1-58 = 0
-4*x^-1 = 49 // : -4
x^-1 = -49/4
-1 < 0
1/(x^1) = -49/4 // * x^1
1 = -49/4*x^1 // : -49/4
-4/49 = x^1
x = -4/49
x = -4/49
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