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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
43 = 18/a+14 // - 18/a+14
43-(18/a)-14 = 0
43-18*a^-1-14 = 0
-18*a^-1 = -29 // : -18
a^-1 = 29/18
-1 < 0
1/(a^1) = 29/18 // * a^1
1 = 29/18*a^1 // : 29/18
18/29 = a^1
a = 18/29
a = 18/29
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