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