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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 1.2/1.6 // - 1.2/1.6
9/x-(1.2/1.6) = 0
9/x-0.75 = 0
9*x^-1 = 0.75 // : 9
x^-1 = 0.08333333
-1 < 0
1/(x^1) = 0.08333333 // * x^1
1 = 0.08333333*x^1 // : 0.08333333
12.00000048 = x^1
x = 12.00000048
x = 12.00000048
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