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r in (-oo:+oo)
2*r+24/8 = 3*r-(9/3) // - 3*r-(9/3)
2*r-(3*r)+24/8+9/3 = 0
2*r-3*r+24/8+9/3 = 0
6-r = 0 // - 6
-r = -6 // * -1
r = 6
r = 6
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