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r in (-oo:+oo)
3*r+6/6 = 3*r-(1/5) // - 3*r-(1/5)
3*r-(3*r)+6/6+1/5 = 0
3*r-3*r+6/6+1/5 = 0
6/5 = 0
r belongs to the empty set
r belongs to the empty set
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