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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 4.7 // - 4.7
14/x-4.7 = 0
14*x^-1 = 4.7 // : 14
x^-1 = 0.33571429
-1 < 0
1/(x^1) = 0.33571429 // * x^1
1 = 0.33571429*x^1 // : 0.33571429
2.97872337 = x^1
x = 2.97872337
x = 2.97872337
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