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r in (-oo:+oo)
3*r+12/6 = 3*r-(12/3) // - 3*r-(12/3)
3*r-(3*r)+12/6+12/3 = 0
3*r-3*r+12/6+12/3 = 0
6 = 0
r belongs to the empty set
r belongs to the empty set
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