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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45.1/x = 1.47 // - 1.47
45.1/x-1.47 = 0
45.1*x^-1 = 1.47 // : 45.1
x^-1 = 0.03259424
-1 < 0
1/(x^1) = 0.03259424 // * x^1
1 = 0.03259424*x^1 // : 0.03259424
30.68026743 = x^1
x = 30.68026743
x = 30.68026743
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