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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/6 = 8/a-3 // - 8/a-3
4/6-(8/a)+3 = 0
4/6-8*a^-1+3 = 0
-8*a^-1 = -11/3 // : -8
a^-1 = 11/24
-1 < 0
1/(a^1) = 11/24 // * a^1
1 = 11/24*a^1 // : 11/24
24/11 = a^1
a = 24/11
a = 24/11
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