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r in (-oo:+oo)
r/12 = 19/10 // - 19/10
r/12-(19/10) = 0
r/12-19/10 = 0
1/12*r-19/10 = 0 // + 19/10
1/12*r = 19/10 // : 1/12
r = 19/10/1/12
r = 114/5
r = 114/5
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