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