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