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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 84/25 // - 84/25
7/x-(84/25) = 0
7/x-84/25 = 0
7*x^-1 = 84/25 // : 7
x^-1 = 12/25
-1 < 0
1/(x^1) = 12/25 // * x^1
1 = 12/25*x^1 // : 12/25
25/12 = x^1
x = 25/12
x = 25/12
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