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r in (-oo:+oo)
(2/3)*r = 5/9 // - 5/9
(2/3)*r-(5/9) = 0
(2/3)*r-5/9 = 0
2/3*r-5/9 = 0 // + 5/9
2/3*r = 5/9 // : 2/3
r = 5/9/2/3
r = 5/6
r = 5/6
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