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r in (-oo:+oo)
r-((1/3)*r) = 5 // - 5
r-((1/3)*r)-5 = 0
r+(-1/3)*r-5 = 0
2/3*r-5 = 0 // + 5
2/3*r = 5 // : 2/3
r = 5/2/3
r = 15/2
r = 15/2
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