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