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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 720/7 // - 720/7
1/x-(720/7) = 0
1/x-720/7 = 0
1*x^-1 = 720/7 // : 1
x^-1 = 720/7
-1 < 0
1/(x^1) = 720/7 // * x^1
1 = 720/7*x^1 // : 720/7
7/720 = x^1
x = 7/720
x = 7/720
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