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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
19/a = 17/9 // - 17/9
19/a-(17/9) = 0
19/a-17/9 = 0
19*a^-1 = 17/9 // : 19
a^-1 = 17/171
-1 < 0
1/(a^1) = 17/171 // * a^1
1 = 17/171*a^1 // : 17/171
171/17 = a^1
a = 171/17
a = 171/17
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