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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/x = 30/48 // - 30/48
32/x-(30/48) = 0
32/x-5/8 = 0
32*x^-1 = 5/8 // : 32
x^-1 = 5/256
-1 < 0
1/(x^1) = 5/256 // * x^1
1 = 5/256*x^1 // : 5/256
256/5 = x^1
x = 256/5
x = 256/5
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