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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/8 = 36/a // - 36/a
9/8-(36/a) = 0
9/8-36*a^-1 = 0
-36*a^-1 = -9/8 // : -36
a^-1 = 1/32
-1 < 0
1/(a^1) = 1/32 // * a^1
1 = 1/32*a^1 // : 1/32
32 = a^1
a = 32
a = 32
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