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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
325/a = 25 // - 25
325/a-25 = 0
325*a^-1 = 25 // : 325
a^-1 = 1/13
-1 < 0
1/(a^1) = 1/13 // * a^1
1 = 1/13*a^1 // : 1/13
13 = a^1
a = 13
a = 13
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