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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 40/100 // - 40/100
14/x-(40/100) = 0
14/x-2/5 = 0
14*x^-1 = 2/5 // : 14
x^-1 = 1/35
-1 < 0
1/(x^1) = 1/35 // * x^1
1 = 1/35*x^1 // : 1/35
35 = x^1
x = 35
x = 35
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