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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
15/a = 25/14 // - 25/14
15/a-(25/14) = 0
15/a-25/14 = 0
15*a^-1 = 25/14 // : 15
a^-1 = 5/42
-1 < 0
1/(a^1) = 5/42 // * a^1
1 = 5/42*a^1 // : 5/42
42/5 = a^1
a = 42/5
a = 42/5
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