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