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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.8/x = 16 // - 16
3.8/x-16 = 0
3.8*x^-1 = 16 // : 3.8
x^-1 = 4.21052632
-1 < 0
1/(x^1) = 4.21052632 // * x^1
1 = 4.21052632*x^1 // : 4.21052632
0.2375 = x^1
x = 0.2375
x = 0.2375
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