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r in (-oo:+oo)
(5/3)*r-8 = (2/3)*r // - (2/3)*r
(5/3)*r-((2/3)*r)-8 = 0
(5/3)*r+(-2/3)*r-8 = 0
r-8 = 0 // + 8
r = 8
r = 8
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