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r in (-oo:+oo)
r-(2/3) = r/5 // - r/5
r-(r/5)-(2/3) = 0
r-(r/5)-2/3 = 0
4/5*r-2/3 = 0 // + 2/3
4/5*r = 2/3 // : 4/5
r = 2/3/4/5
r = 5/6
r = 5/6
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