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r in (-oo:+oo)
8*r = 6/7 // - 6/7
8*r-(6/7) = 0
8*r-6/7 = 0
8*r-6/7 = 0 // + 6/7
8*r = 6/7 // : 8
r = 6/7/8
r = 3/28
r = 3/28
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