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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
592/629 = 128/a // - 128/a
592/629-(128/a) = 0
592/629-128*a^-1 = 0
-128*a^-1 = -16/17 // : -128
a^-1 = 1/136
-1 < 0
1/(a^1) = 1/136 // * a^1
1 = 1/136*a^1 // : 1/136
136 = a^1
a = 136
a = 136
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