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r in (-oo:+oo)
4/12 = r+2/16 // - r+2/16
4/12-r-(2/16) = 0
4/12-r-1/8 = 0
5/24-r = 0 // - 5/24
-r = -5/24 // * -1
r = 5/24
r = 5/24
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