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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20/x = 14 // - 14
20/x-14 = 0
20*x^-1 = 14 // : 20
x^-1 = 7/10
-1 < 0
1/(x^1) = 7/10 // * x^1
1 = 7/10*x^1 // : 7/10
10/7 = x^1
x = 10/7
x = 10/7
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