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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/2 = -4/a // + -4/a
3/2-(-4/a) = 0
4*a^-1+3/2 = 0
4*a^-1 = -3/2 // : 4
a^-1 = -3/8
-1 < 0
1/(a^1) = -3/8 // * a^1
1 = -3/8*a^1 // : -3/8
-8/3 = a^1
a = -8/3
a = -8/3
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