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