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r in (-oo:+oo)
4*r = 2/3 // - 2/3
4*r-(2/3) = 0
4*r-2/3 = 0
4*r-2/3 = 0 // + 2/3
4*r = 2/3 // : 4
r = 2/3/4
r = 1/6
r = 1/6
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