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r in (-oo:+oo)
(4/7)*r = 2/9 // - 2/9
(4/7)*r-(2/9) = 0
(4/7)*r-2/9 = 0
4/7*r-2/9 = 0 // + 2/9
4/7*r = 2/9 // : 4/7
r = 2/9/4/7
r = 7/18
r = 7/18
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