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r in (-oo:+oo)
2*r+6/8 = 4*r-(24/4) // - 4*r-(24/4)
2*r-(4*r)+6/8+24/4 = 0
2*r-4*r+6/8+24/4 = 0
27/4-2*r = 0 // - 27/4
-2*r = -27/4 // : -2
r = -27/4/(-2)
r = 27/8
r = 27/8
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