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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/2 = 4.8/x // - 4.8/x
1/2-(4.8/x) = 0
1/2-4.8*x^-1 = 0
-4.8*x^-1 = -1/2 // : -4.8
x^-1 = 0.10416667
-1 < 0
1/(x^1) = 0.10416667 // * x^1
1 = 0.10416667*x^1 // : 0.10416667
9.59999969 = x^1
x = 9.59999969
x = 9.59999969
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