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r in (-oo:+oo)
4*r-(1/3) = 2-r // - 2-r
4*r+r-(1/3)-2 = 0
4*r+r-1/3-2 = 0
5*r-7/3 = 0 // + 7/3
5*r = 7/3 // : 5
r = 7/3/5
r = 7/15
r = 7/15
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