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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/7 = 5/x // - 5/x
2/7-(5/x) = 0
2/7-5*x^-1 = 0
-5*x^-1 = -2/7 // : -5
x^-1 = 2/35
-1 < 0
1/(x^1) = 2/35 // * x^1
1 = 2/35*x^1 // : 2/35
35/2 = x^1
x = 35/2
x = 35/2
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