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r in (-oo:+oo)
8*r = 56/23 // - 56/23
8*r-(56/23) = 0
8*r-56/23 = 0
8*r-56/23 = 0 // + 56/23
8*r = 56/23 // : 8
r = 56/23/8
r = 7/23
r = 7/23
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