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r in (-oo:+oo)
(6.5/3)*r+5 = 24.5 // - 24.5
(6.5/3)*r-24.5+5 = 0
2.16666667*r-19.5 = 0 // + 19.5
2.16666667*r = 19.5 // : 2.16666667
r = 19.5/2.16666667
r = 8.99999999
r = 8.99999999
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