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r in (-oo:+oo)
(2/3)*r-(1/4) = 5/12 // - 5/12
(2/3)*r-(1/4)-(5/12) = 0
(2/3)*r-1/4-5/12 = 0
2/3*r-2/3 = 0 // + 2/3
2/3*r = 2/3 // : 2/3
r = 2/3/2/3
r = 1
r = 1
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