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r in (-oo:+oo)
(8*(2*r-3))/3 = 8*r-(1/7) // - 8*r-(1/7)
(8*(2*r-3))/3-(8*r)+1/7 = 0
(8*(2*r-3))/3-8*r+1/7 = 0
(7*8*(2*r-3))/(3*7)+(-8*3*7*r)/(3*7)+(1*3)/(3*7) = 0
7*8*(2*r-3)-8*3*7*r+1*3 = 0
3-56*r-168 = 0
-56*r-165 = 0
(-56*r-165)/(3*7) = 0
(-56*r-165)/(3*7) = 0 // * 3*7
-56*r-165 = 0
-56*r-165 = 0 // + 165
-56*r = 165 // : -56
r = 165/(-56)
r = -165/56
r = -165/56
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