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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2-6/a = 14 // - 14
2-6/a-14 = 0
-6*a^-1 = 12 // : -6
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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