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r in (-oo:+oo)
8*r-(24/3) = 4*r-(7/4) // - 4*r-(7/4)
8*r-(4*r)-(24/3)+7/4 = 0
8*r-4*r+7/4-8 = 0
4*r-25/4 = 0 // + 25/4
4*r = 25/4 // : 4
r = 25/4/4
r = 25/16
r = 25/16
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