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