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r in (-oo:+oo)
4*r+12/16 = 4*r-(12/4) // - 4*r-(12/4)
4*r-(4*r)+12/16+12/4 = 0
4*r-4*r+12/16+12/4 = 0
15/4 = 0
r belongs to the empty set
r belongs to the empty set
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