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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 43/100 // - 43/100
14/x-(43/100) = 0
14/x-43/100 = 0
14*x^-1 = 43/100 // : 14
x^-1 = 43/1400
-1 < 0
1/(x^1) = 43/1400 // * x^1
1 = 43/1400*x^1 // : 43/1400
1400/43 = x^1
x = 1400/43
x = 1400/43
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