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