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r in (-oo:+oo)
3-((1/2)*r) = 5*r-((2/3)*r) // - 5*r-((2/3)*r)
(2/3)*r-((1/2)*r)-(5*r)+3 = 0
(-1/2)*r-5*r+(2/3)*r+3 = 0
3-29/6*r = 0 // - 3
-29/6*r = -3 // : -29/6
r = -3/(-29/6)
r = 18/29
r = 18/29
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