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r in (-oo:+oo)
3*r+6/9 = 2*r-(4/2) // - 2*r-(4/2)
3*r-(2*r)+6/9+4/2 = 0
3*r-2*r+6/9+4/2 = 0
r+8/3 = 0 // - 8/3
r = -8/3
r = -8/3
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