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r in (-oo:+oo)
2*r+8/6 = 4*r-(1/11) // - 4*r-(1/11)
2*r-(4*r)+8/6+1/11 = 0
2*r-4*r+8/6+1/11 = 0
47/33-2*r = 0 // - 47/33
-2*r = -47/33 // : -2
r = -47/33/(-2)
r = 47/66
r = 47/66
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