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r in (-oo:+oo)
-451/12 = 3*r-((5/2)*((-11/3)*r-2)) // - 3*r-((5/2)*((-11/3)*r-2))
(5/2)*((-11/3)*r-2)-(3*r)-451/12 = 0
(5/2)*((-11/3)*r-2)-3*r-451/12 = 0
5/2*(-11/3*r-2)-3*r-451/12 = 0
(5/2*12*(-11/3*r-2))/12+(-3*12*r)/12-451/12 = 0
5/2*12*(-11/3*r-2)-3*12*r-451 = 0
-146*r-451-60 = 0
-146*r-511 = 0
(-146*r-511)/12 = 0
(-146*r-511)/12 = 0 // * 12
-146*r-511 = 0
-146*r-511 = 0 // + 511
-146*r = 511 // : -146
r = 511/(-146)
r = -7/2
r = -7/2
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