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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
66/x = 7/102 // - 7/102
66/x-(7/102) = 0
66/x-7/102 = 0
66*x^-1 = 7/102 // : 66
x^-1 = 7/6732
-1 < 0
1/(x^1) = 7/6732 // * x^1
1 = 7/6732*x^1 // : 7/6732
6732/7 = x^1
x = 6732/7
x = 6732/7
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