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r in (-oo:+oo)
3*r+18/12 = 4*r-(24/4) // - 4*r-(24/4)
3*r-(4*r)+18/12+24/4 = 0
3*r-4*r+18/12+24/4 = 0
15/2-r = 0 // - 15/2
-r = -15/2 // * -1
r = 15/2
r = 15/2
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