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r in (-oo:+oo)
r/12 = 11/12 // - 11/12
r/12-(11/12) = 0
r/12-11/12 = 0
1/12*r-11/12 = 0 // + 11/12
1/12*r = 11/12 // : 1/12
r = 11/12/1/12
r = 11
r = 11
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