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r in (-oo:+oo)
(3*(2*r-2))/5 = 3*r-(2/3) // - 3*r-(2/3)
(3*(2*r-2))/5-(3*r)+2/3 = 0
(3*(2*r-2))/5-3*r+2/3 = 0
(3^2*(2*r-2))/(3*5)+(-3*3*5*r)/(3*5)+(2*5)/(3*5) = 0
3^2*(2*r-2)-3*3*5*r+2*5 = 0
10-27*r-18 = 0
-27*r-8 = 0
(-27*r-8)/(3*5) = 0
(-27*r-8)/(3*5) = 0 // * 3*5
-27*r-8 = 0
-27*r-8 = 0 // + 8
-27*r = 8 // : -27
r = 8/(-27)
r = -8/27
r = -8/27
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