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r in (-oo:+oo)
(5*(2*r-5))/3 = 5*r-(12/2) // - 5*r-(12/2)
(5*(2*r-5))/3-(5*r)+12/2 = 0
(5*(2*r-5))/3-5*r+12/2 = 0
(5*(2*r-5))/3-5*r+6 = 0
(5*(2*r-5))/3+(-5*3*r)/3+(3*6)/3 = 0
5*(2*r-5)-5*3*r+3*6 = 0
18-5*r-25 = 0
-5*r-7 = 0
(-5*r-7)/3 = 0
(-5*r-7)/3 = 0 // * 3
-5*r-7 = 0
-5*r-7 = 0 // + 7
-5*r = 7 // : -5
r = 7/(-5)
r = -7/5
r = -7/5
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