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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56.6/x = 1.47 // - 1.47
56.6/x-1.47 = 0
56.6*x^-1 = 1.47 // : 56.6
x^-1 = 0.02597173
-1 < 0
1/(x^1) = 0.02597173 // * x^1
1 = 0.02597173*x^1 // : 0.02597173
38.50340351 = x^1
x = 38.50340351
x = 38.50340351
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