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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/6 = 6/a // - 6/a
4/6-(6/a) = 0
4/6-6*a^-1 = 0
-6*a^-1 = -2/3 // : -6
a^-1 = 1/9
-1 < 0
1/(a^1) = 1/9 // * a^1
1 = 1/9*a^1 // : 1/9
9 = a^1
a = 9
a = 9
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