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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/4.8 = 11/x // - 11/x
8/4.8-(11/x) = 0
8/4.8-11*x^-1 = 0
-11*x^-1 = -1.66666667 // : -11
x^-1 = 0.15151515
-1 < 0
1/(x^1) = 0.15151515 // * x^1
1 = 0.15151515*x^1 // : 0.15151515
6.60000007 = x^1
x = 6.60000007
x = 6.60000007
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