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a in (-oo:+oo)
((2*a+9)^1)/2-a+3 = 0
(2*a+9)/2-a+3 = 0
(2*a+9)/2+(2*(-a))/2+(2*3)/2 = 0
2*a+2*(-a)+2*3+9 = 0
6+9 = 0
15 = 0
15/2 = 0
15/2 = 0 // * 2
15 = 0
a belongs to the empty set
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