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r in (-oo:+oo)
(5/6)*(r+7) = 1/6-r // - 1/6-r
(5/6)*(r+7)+r-(1/6) = 0
(5/6)*(r+7)+r-1/6 = 0
5/6*(r+7)+r-1/6 = 0
(5/6*6*(r+7))/6+(6*r)/6-1/6 = 0
5/6*6*(r+7)+6*r-1 = 0
11*r-1+35 = 0
11*r+34 = 0
(11*r+34)/6 = 0
(11*r+34)/6 = 0 // * 6
11*r+34 = 0
11*r+34 = 0 // - 34
11*r = -34 // : 11
r = -34/11
r = -34/11
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