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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.445 = 6/x // - 6/x
0.445-(6/x) = 0
0.445-6*x^-1 = 0
-6*x^-1 = -0.445 // : -6
x^-1 = 0.07416667
-1 < 0
1/(x^1) = 0.07416667 // * x^1
1 = 0.07416667*x^1 // : 0.07416667
13.48314546 = x^1
x = 13.48314546
x = 13.48314546
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