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r in (-oo:+oo)
(3/2)*r-1 = (1/2)*r // - (1/2)*r
(3/2)*r-((1/2)*r)-1 = 0
(3/2)*r+(-1/2)*r-1 = 0
r-1 = 0 // + 1
r = 1
r = 1
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