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r in (-oo:+oo)
(3*r)/5 = 2/3 // - 2/3
(3*r)/5-(2/3) = 0
(3*r)/5-2/3 = 0
3/5*r-2/3 = 0 // + 2/3
3/5*r = 2/3 // : 3/5
r = 2/3/3/5
r = 10/9
r = 10/9
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