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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/4.8 = 1/x+1/x-4 // - 1/x+1/x-4
1/4.8-(1/x)-(1/x)+4 = 0
1/4.8-x^-1-x^-1+4 = 0
-2*x^-1 = -4.20833333 // : -2
x^-1 = 2.10416667
-1 < 0
1/(x^1) = 2.10416667 // * x^1
1 = 2.10416667*x^1 // : 2.10416667
0.47524752 = x^1
x = 0.47524752
x = 0.47524752
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