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r in (-oo:+oo)
5*r+15/10 = 5*r-(5/5) // - 5*r-(5/5)
5*r-(5*r)+15/10+5/5 = 0
5*r-5*r+15/10+5/5 = 0
5/2 = 0
r belongs to the empty set
r belongs to the empty set
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