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r in (-oo:+oo)
(9/4)*r = 2732 // - 2732
(9/4)*r-2732 = 0
9/4*r-2732 = 0 // + 2732
9/4*r = 2732 // : 9/4
r = 2732/9/4
r = 10928/9
r = 10928/9
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