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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
65/1 = 7/x // - 7/x
65/1-(7/x) = 0
65-7*x^-1 = 0
-7*x^-1 = -65 // : -7
x^-1 = 65/7
-1 < 0
1/(x^1) = 65/7 // * x^1
1 = 65/7*x^1 // : 65/7
7/65 = x^1
x = 7/65
x = 7/65
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