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r in (-oo:+oo)
(7/6)*r-9 = (1/6)*r // - (1/6)*r
(7/6)*r-((1/6)*r)-9 = 0
(7/6)*r+(-1/6)*r-9 = 0
r-9 = 0 // + 9
r = 9
r = 9
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