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r in (-oo:+oo)
3*r+24/9 = 2*r-(4/2) // - 2*r-(4/2)
3*r-(2*r)+24/9+4/2 = 0
3*r-2*r+24/9+4/2 = 0
r+14/3 = 0 // - 14/3
r = -14/3
r = -14/3
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