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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a = 10/a+1 // - 10/a+1
5/a-(10/a)-1 = 0
5/a-10*a^-1-1 = 0
-5*a^-1 = 1 // : -5
a^-1 = -1/5
-1 < 0
1/(a^1) = -1/5 // * a^1
1 = -1/5*a^1 // : -1/5
-5 = a^1
a = -5
a = -5
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