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r in (-oo:+oo)
(3/4)*r = 5/9 // - 5/9
(3/4)*r-(5/9) = 0
(3/4)*r-5/9 = 0
3/4*r-5/9 = 0 // + 5/9
3/4*r = 5/9 // : 3/4
r = 5/9/3/4
r = 20/27
r = 20/27
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