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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a = 5/15 // - 5/15
2/a-(5/15) = 0
2/a-1/3 = 0
2*a^-1 = 1/3 // : 2
a^-1 = 1/6
-1 < 0
1/(a^1) = 1/6 // * a^1
1 = 1/6*a^1 // : 1/6
6 = a^1
a = 6
a = 6
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