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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.3/x = 0.32 // - 0.32
5.3/x-0.32 = 0
5.3*x^-1 = 0.32 // : 5.3
x^-1 = 0.06037736
-1 < 0
1/(x^1) = 0.06037736 // * x^1
1 = 0.06037736*x^1 // : 0.06037736
16.56249959 = x^1
x = 16.56249959
x = 16.56249959
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