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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a = -5/3 // + -5/3
6/a-(-5/3) = 0
6/a+5/3 = 0
6*a^-1 = -5/3 // : 6
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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