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r in (-oo:+oo)
(5*(2*r-3))/3 = 5*r-(5/4) // - 5*r-(5/4)
(5*(2*r-3))/3-(5*r)+5/4 = 0
(5*(2*r-3))/3-5*r+5/4 = 0
(4*5*(2*r-3))/(3*4)+(-5*3*4*r)/(3*4)+(3*5)/(3*4) = 0
4*5*(2*r-3)-5*3*4*r+3*5 = 0
15-20*r-60 = 0
-20*r-45 = 0
(-20*r-45)/(3*4) = 0
(-20*r-45)/(3*4) = 0 // * 3*4
-20*r-45 = 0
-20*r-45 = 0 // + 45
-20*r = 45 // : -20
r = 45/(-20)
r = -9/4
r = -9/4
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