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