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r in (-oo:+oo)
(6/5)*r-1 = (1/5)*r // - (1/5)*r
(6/5)*r-((1/5)*r)-1 = 0
(6/5)*r+(-1/5)*r-1 = 0
r-1 = 0 // + 1
r = 1
r = 1
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