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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
30/a = 25/(-6) // - 25/(-6)
30/a-(25/(-6)) = 0
30/a+25/6 = 0
30*a^-1 = -25/6 // : 30
a^-1 = -5/36
-1 < 0
1/(a^1) = -5/36 // * a^1
1 = -5/36*a^1 // : -5/36
-36/5 = a^1
a = -36/5
a = -36/5
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