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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a+2/a-1 = a+11/a+4 // - a+11/a+4
a-a+2/a-(11/a)-4-1 = 0
a-a+2/a-11*a^-1-4-1 = 0
-9*a^-1 = 5 // : -9
a^-1 = -5/9
-1 < 0
1/(a^1) = -5/9 // * a^1
1 = -5/9*a^1 // : -5/9
-9/5 = a^1
a = -9/5
a = -9/5
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