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D( a )
3*a = 0
3*a = 0
3*a = 0
3*a = 0 // : 3
a = 0
a in (-oo:0) U (0:+oo)
4/(3*a)-(5/(3*a)) = 0
4/(3*a)+(-5/3)*a^-1 = 0
-1/3*a^-1 = 0 // : -1/3
a^-1 = 0
a naleu017Cy do O
a belongs to the empty set
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