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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/17 = 3/a // - 3/a
9/17-(3/a) = 0
9/17-3*a^-1 = 0
-3*a^-1 = -9/17 // : -3
a^-1 = 3/17
-1 < 0
1/(a^1) = 3/17 // * a^1
1 = 3/17*a^1 // : 3/17
17/3 = a^1
a = 17/3
a = 17/3
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