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R in (-oo:+oo)
(1/2)*R = 5/2 // - 5/2
(1/2)*R-(5/2) = 0
(1/2)*R-5/2 = 0
1/2*R-5/2 = 0 // + 5/2
1/2*R = 5/2 // : 1/2
R = 5/2/1/2
R = 5
R = 5
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