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r in (-oo:+oo)
2*r-(1/3) = 5 // - 5
2*r-(1/3)-5 = 0
2*r-1/3-5 = 0
2*r-16/3 = 0 // + 16/3
2*r = 16/3 // : 2
r = 16/3/2
r = 8/3
r = 8/3
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