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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a/a+4/3+4 = 4-4/a // - 4-4/a
a/a-(-4/a)+4/3-4+4 = 0
4*a^-1+a/a+4/3-4+4 = 0
4*a^-1 = -7/3 // : 4
a^-1 = -7/12
-1 < 0
1/(a^1) = -7/12 // * a^1
1 = -7/12*a^1 // : -7/12
-12/7 = a^1
a = -12/7
a = -12/7
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