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y in (-oo:+oo)
2*y+5 = 4*((1/2)*y+3) // - 4*((1/2)*y+3)
2*y-(4*((1/2)*y+3))+5 = 0
2*y-4*((1/2)*y+3)+5 = 0
2*y-4*(1/2*y+3)+5 = 0
2*y-4*(1/2*y+3)+5 = 0
5-12 = 0
-7 = 0
-7 = 0
y belongs to the empty set
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