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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/27 = 1.1/x // - 1.1/x
20/27-(1.1/x) = 0
20/27-1.1*x^-1 = 0
-1.1*x^-1 = -20/27 // : -1.1
x^-1 = 0.67340067
-1 < 0
1/(x^1) = 0.67340067 // * x^1
1 = 0.67340067*x^1 // : 0.67340067
1.48500001 = x^1
x = 1.48500001
x = 1.48500001
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