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r in (-oo:+oo)
3/8 = r+2/2 // - r+2/2
3/8-r-(2/2) = 0
3/8-r-1 = 0
-r-5/8 = 0 // + 5/8
-r = 5/8 // * -1
r = -5/8
r = -5/8
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