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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/30 = 1/x // - 1/x
7/30-(1/x) = 0
7/30-x^-1 = 0
-1*x^-1 = -7/30 // : -1
x^-1 = 7/30
-1 < 0
1/(x^1) = 7/30 // * x^1
1 = 7/30*x^1 // : 7/30
30/7 = x^1
x = 30/7
x = 30/7
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