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r in (-oo:+oo)
(4/3)*r-6 = (2/3)*r // - (2/3)*r
(4/3)*r-((2/3)*r)-6 = 0
(4/3)*r+(-2/3)*r-6 = 0
2/3*r-6 = 0 // + 6
2/3*r = 6 // : 2/3
r = 6/2/3
r = 9
r = 9
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