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