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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 18/70 // - 18/70
5/x-(18/70) = 0
5/x-9/35 = 0
5*x^-1 = 9/35 // : 5
x^-1 = 9/175
-1 < 0
1/(x^1) = 9/175 // * x^1
1 = 9/175*x^1 // : 9/175
175/9 = x^1
x = 175/9
x = 175/9
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