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r in (-oo:+oo)
2*r+24/8 = 2*r-(24/2) // - 2*r-(24/2)
2*r-(2*r)+24/8+24/2 = 0
2*r-2*r+24/8+24/2 = 0
15 = 0
r belongs to the empty set
r belongs to the empty set
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