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