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R in (-oo:+oo)
(1/2)*R = 3/16 // - 3/16
(1/2)*R-(3/16) = 0
(1/2)*R-3/16 = 0
1/2*R-3/16 = 0 // + 3/16
1/2*R = 3/16 // : 1/2
R = 3/16/1/2
R = 3/8
R = 3/8
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