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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/6 = 12/a // - 12/a
9/6-(12/a) = 0
9/6-12*a^-1 = 0
-12*a^-1 = -3/2 // : -12
a^-1 = 1/8
-1 < 0
1/(a^1) = 1/8 // * a^1
1 = 1/8*a^1 // : 1/8
8 = a^1
a = 8
a = 8
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