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r in (-oo:+oo)
4*r+16/8 = 4*r-(16/4) // - 4*r-(16/4)
4*r-(4*r)+16/8+16/4 = 0
4*r-4*r+16/8+16/4 = 0
6 = 0
r belongs to the empty set
r belongs to the empty set
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