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