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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3/x = -8 // + 8
8-3/x = 0
-3*x^-1 = -8 // : -3
x^-1 = 8/3
-1 < 0
1/(x^1) = 8/3 // * x^1
1 = 8/3*x^1 // : 8/3
3/8 = x^1
x = 3/8
x = 3/8
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