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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
14/a = 6.8 // - 6.8
14/a-6.8 = 0
14*a^-1 = 6.8 // : 14
a^-1 = 0.48571429
-1 < 0
1/(a^1) = 0.48571429 // * a^1
1 = 0.48571429*a^1 // : 0.48571429
2.05882351 = a^1
a = 2.05882351
a = 2.05882351
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