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r in (-oo:+oo)
(3/8)*r = 15/16 // - 15/16
(3/8)*r-(15/16) = 0
(3/8)*r-15/16 = 0
3/8*r-15/16 = 0 // + 15/16
3/8*r = 15/16 // : 3/8
r = 15/16/3/8
r = 5/2
r = 5/2
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