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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.8/x = 1.3/2.71 // - 1.3/2.71
2.8/x-(1.3/2.71) = 0
2.8/x-0.4797048 = 0
2.8*x^-1 = 0.4797048 // : 2.8
x^-1 = 0.17132314
-1 < 0
1/(x^1) = 0.17132314 // * x^1
1 = 0.17132314*x^1 // : 0.17132314
5.83692314 = x^1
x = 5.83692314
x = 5.83692314
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