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a in (-oo:+oo)
2*a+6 = (1/2)*(4*a-6) // - (1/2)*(4*a-6)
2*a-((1/2)*(4*a-6))+6 = 0
(-1/2)*(4*a-6)+2*a+6 = 0
2*a-1/2*(4*a-6)+6 = 0
2*a-1/2*(4*a-6)+6 = 0
3+6 = 0
9 = 0
9 = 0
a belongs to the empty set
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