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