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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
36/a = 4 // - 4
36/a-4 = 0
36*a^-1 = 4 // : 36
a^-1 = 1/9
-1 < 0
1/(a^1) = 1/9 // * a^1
1 = 1/9*a^1 // : 1/9
9 = a^1
a = 9
a = 9
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