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r in (-oo:+oo)
(8*(2*r-2))/5 = 8*r-(1/6) // - 8*r-(1/6)
(8*(2*r-2))/5-(8*r)+1/6 = 0
(8*(2*r-2))/5-8*r+1/6 = 0
(6*8*(2*r-2))/(5*6)+(-8*5*6*r)/(5*6)+(1*5)/(5*6) = 0
6*8*(2*r-2)-8*5*6*r+1*5 = 0
5-144*r-96 = 0
-144*r-91 = 0
(-144*r-91)/(5*6) = 0
(-144*r-91)/(5*6) = 0 // * 5*6
-144*r-91 = 0
-144*r-91 = 0 // + 91
-144*r = 91 // : -144
r = 91/(-144)
r = -91/144
r = -91/144
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