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r in (-oo:+oo)
3*r+12/9 = 4*r-(1/11) // - 4*r-(1/11)
3*r-(4*r)+12/9+1/11 = 0
3*r-4*r+12/9+1/11 = 0
47/33-r = 0 // - 47/33
-r = -47/33 // * -1
r = 47/33
r = 47/33
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