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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 4.1/1 // - 4.1/1
18/x-(4.1/1) = 0
18/x-4.1 = 0
18*x^-1 = 4.1 // : 18
x^-1 = 0.22777778
-1 < 0
1/(x^1) = 0.22777778 // * x^1
1 = 0.22777778*x^1 // : 0.22777778
4.39024386 = x^1
x = 4.39024386
x = 4.39024386
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