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r in (-oo:+oo)
3*r+18/9 = 3*r-(18/3) // - 3*r-(18/3)
3*r-(3*r)+18/9+18/3 = 0
3*r-3*r+18/9+18/3 = 0
8 = 0
r belongs to the empty set
r belongs to the empty set
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