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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.3/x = 18/3 // - 18/3
6.3/x-(18/3) = 0
6.3/x-6 = 0
6.3*x^-1 = 6 // : 6.3
x^-1 = 0.95238095
-1 < 0
1/(x^1) = 0.95238095 // * x^1
1 = 0.95238095*x^1 // : 0.95238095
1.05 = x^1
x = 1.05
x = 1.05
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