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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
29/x = 14.5/10 // - 14.5/10
29/x-(14.5/10) = 0
29/x-1.45 = 0
29*x^-1 = 1.45 // : 29
x^-1 = 0.05
-1 < 0
1/(x^1) = 0.05 // * x^1
1 = 0.05*x^1 // : 0.05
20 = x^1
x = 20
x = 20
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