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r in (-oo:+oo)
(9/4)*r = 27/32 // - 27/32
(9/4)*r-(27/32) = 0
(9/4)*r-27/32 = 0
9/4*r-27/32 = 0 // + 27/32
9/4*r = 27/32 // : 9/4
r = 27/32/9/4
r = 3/8
r = 3/8
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