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