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r in (-oo:+oo)
(11/6)*r-2 = (5/6)*r // - (5/6)*r
(11/6)*r-((5/6)*r)-2 = 0
(11/6)*r+(-5/6)*r-2 = 0
r-2 = 0 // + 2
r = 2
r = 2
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