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r in (-oo:+oo)
(2*r)/9-(4/9) = 2/9 // - 2/9
(2*r)/9-(4/9)-(2/9) = 0
(2*r)/9-4/9-2/9 = 0
2/9*r-2/3 = 0 // + 2/3
2/9*r = 2/3 // : 2/9
r = 2/3/2/9
r = 3
r = 3
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