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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
124 = 64/x // - 64/x
124-(64/x) = 0
124-64*x^-1 = 0
-64*x^-1 = -124 // : -64
x^-1 = 31/16
-1 < 0
1/(x^1) = 31/16 // * x^1
1 = 31/16*x^1 // : 31/16
16/31 = x^1
x = 16/31
x = 16/31
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