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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
-5 = 18/a // - 18/a
-(18/a)-5 = 0
-18*a^-1-5 = 0
-18*a^-1 = 5 // : -18
a^-1 = -5/18
-1 < 0
1/(a^1) = -5/18 // * a^1
1 = -5/18*a^1 // : -5/18
-18/5 = a^1
a = -18/5
a = -18/5
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