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r in (-oo:+oo)
(9/5)*r-6 = (4/5)*r // - (4/5)*r
(9/5)*r-((4/5)*r)-6 = 0
(9/5)*r+(-4/5)*r-6 = 0
r-6 = 0 // + 6
r = 6
r = 6
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