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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.8/x = 6.2/2.7 // - 6.2/2.7
5.8/x-(6.2/2.7) = 0
5.8/x-2.2962963 = 0
5.8*x^-1 = 2.2962963 // : 5.8
x^-1 = 0.39591316
-1 < 0
1/(x^1) = 0.39591316 // * x^1
1 = 0.39591316*x^1 // : 0.39591316
2.52580642 = x^1
x = 2.52580642
x = 2.52580642
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