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r in (-oo:+oo)
(1/2)*r = 7/8 // - 7/8
(1/2)*r-(7/8) = 0
(1/2)*r-7/8 = 0
1/2*r-7/8 = 0 // + 7/8
1/2*r = 7/8 // : 1/2
r = 7/8/1/2
r = 7/4
r = 7/4
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