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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 70/28 // - 70/28
3/x-(70/28) = 0
3/x-5/2 = 0
3*x^-1 = 5/2 // : 3
x^-1 = 5/6
-1 < 0
1/(x^1) = 5/6 // * x^1
1 = 5/6*x^1 // : 5/6
6/5 = x^1
x = 6/5
x = 6/5
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