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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.6/10.2 = 2.8/x // - 2.8/x
4.6/10.2-(2.8/x) = 0
4.6/10.2-2.8*x^-1 = 0
-2.8*x^-1 = -0.45098039 // : -2.8
x^-1 = 0.16106443
-1 < 0
1/(x^1) = 0.16106443 // * x^1
1 = 0.16106443*x^1 // : 0.16106443
6.20869549 = x^1
x = 6.20869549
x = 6.20869549
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