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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*(1.2/x) = 20 // - 20
4*(1.2/x)-20 = 0
4.8*x^-1 = 20 // : 4.8
x^-1 = 4.16666667
-1 < 0
1/(x^1) = 4.16666667 // * x^1
1 = 4.16666667*x^1 // : 4.16666667
0.24 = x^1
x = 0.24
x = 0.24
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