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