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r in (-oo:+oo)
r/20 = 5.5/12 // - 5.5/12
r/20-(5.5/12) = 0
r/20-0.45833333 = 0
1/20*r-0.45833333 = 0 // + 0.45833333
1/20*r = 0.45833333 // : 1/20
r = 0.45833333/1/20
r = 9.1666666
r = 9.1666666
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