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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 2/7 // - 2/7
5/x-(2/7) = 0
5/x-2/7 = 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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