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r in (-oo:+oo)
(1/6)*(r-18) = 5/6 // - 5/6
(1/6)*(r-18)-(5/6) = 0
(1/6)*(r-18)-5/6 = 0
1/6*(r-18)-5/6 = 0
(1/6*6*(r-18))/6-5/6 = 0
1/6*6*(r-18)-5 = 0
r-23 = 0
(r-23)/6 = 0
(r-23)/6 = 0 // * 6
r-23 = 0
r-23 = 0 // + 23
r = 23
r = 23
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