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r in (-oo:+oo)
(2*r)/8 = 24/32 // - 24/32
(2*r)/8-(24/32) = 0
(2*r)/8-3/4 = 0
1/4*r-3/4 = 0 // + 3/4
1/4*r = 3/4 // : 1/4
r = 3/4/1/4
r = 3
r = 3
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