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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.24 = 18/x // - 18/x
0.24-(18/x) = 0
0.24-18*x^-1 = 0
-18*x^-1 = -0.24 // : -18
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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