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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.32 = 24/x // - 24/x
0.32-(24/x) = 0
0.32-24*x^-1 = 0
-24*x^-1 = -0.32 // : -24
x^-1 = 0.01333333
-1 < 0
1/(x^1) = 0.01333333 // * x^1
1 = 0.01333333*x^1 // : 0.01333333
75.00001875 = x^1
x = 75.00001875
x = 75.00001875
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