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r in (-oo:+oo)
(3/4)*r = 4/5 // - 4/5
(3/4)*r-(4/5) = 0
(3/4)*r-4/5 = 0
3/4*r-4/5 = 0 // + 4/5
3/4*r = 4/5 // : 3/4
r = 4/5/3/4
r = 16/15
r = 16/15
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