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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.1/x = 5.7/3.6 // - 5.7/3.6
5.1/x-(5.7/3.6) = 0
5.1/x-1.58333333 = 0
5.1*x^-1 = 1.58333333 // : 5.1
x^-1 = 0.31045752
-1 < 0
1/(x^1) = 0.31045752 // * x^1
1 = 0.31045752*x^1 // : 0.31045752
3.22105259 = x^1
x = 3.22105259
x = 3.22105259
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