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r in (-oo:+oo)
9*r+1/4 = 5/12 // - 5/12
9*r+1/4-(5/12) = 0
9*r+1/4-5/12 = 0
9*r-1/6 = 0 // + 1/6
9*r = 1/6 // : 9
r = 1/6/9
r = 1/54
r = 1/54
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