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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7.4/x = 1/0.3 // - 1/0.3
7.4/x-(1/0.3) = 0
7.4/x-3.33333333 = 0
7.4*x^-1 = 3.33333333 // : 7.4
x^-1 = 0.45045045
-1 < 0
1/(x^1) = 0.45045045 // * x^1
1 = 0.45045045*x^1 // : 0.45045045
2.22 = x^1
x = 2.22
x = 2.22
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