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r in (-oo:+oo)
(4/3)*r-7 = (1/3)*r // - (1/3)*r
(4/3)*r-((1/3)*r)-7 = 0
(4/3)*r+(-1/3)*r-7 = 0
r-7 = 0 // + 7
r = 7
r = 7
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