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r in (-oo:+oo)
(3/2)*r-5 = (1/2)*r // - (1/2)*r
(3/2)*r-((1/2)*r)-5 = 0
(3/2)*r+(-1/2)*r-5 = 0
r-5 = 0 // + 5
r = 5
r = 5
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