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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 15/7 // - 15/7
2/x-(15/7) = 0
2/x-15/7 = 0
2*x^-1 = 15/7 // : 2
x^-1 = 15/14
-1 < 0
1/(x^1) = 15/14 // * x^1
1 = 15/14*x^1 // : 15/14
14/15 = x^1
x = 14/15
x = 14/15
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