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r in (-oo:+oo)
(5*(2*r-5))/3 = 5*r-(9/5) // - 5*r-(9/5)
(5*(2*r-5))/3-(5*r)+9/5 = 0
(5*(2*r-5))/3-5*r+9/5 = 0
(5^2*(2*r-5))/(3*5)+(-5*3*5*r)/(3*5)+(3*9)/(3*5) = 0
5^2*(2*r-5)-5*3*5*r+3*9 = 0
27-25*r-125 = 0
-25*r-98 = 0
(-25*r-98)/(3*5) = 0
(-25*r-98)/(3*5) = 0 // * 3*5
-25*r-98 = 0
-25*r-98 = 0 // + 98
-25*r = 98 // : -25
r = 98/(-25)
r = -98/25
r = -98/25
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