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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-5 = 8-48/x // - 8-48/x
4/x-(-48/x)-8-5 = 0
4/x+48*x^-1-8-5 = 0
52*x^-1 = 13 // : 52
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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