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r in (-oo:+oo)
(9/8)*r-(1/2) = (1/8)*r // - (1/8)*r
(9/8)*r-((1/8)*r)-(1/2) = 0
(9/8)*r+(-1/8)*r-1/2 = 0
r-1/2 = 0 // + 1/2
r = 1/2
r = 1/2
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