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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/a-3+2 = a/a-3 // - a/a-3
3/a-(a/a)-3+2+3 = 0
3/a-3-1+2+3 = 0
3*a^-1 = -1 // : 3
a^-1 = -1/3
-1 < 0
1/(a^1) = -1/3 // * a^1
1 = -1/3*a^1 // : -1/3
-3 = a^1
a = -3
a = -3
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