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n in (-oo:+oo)
(9*n)/10-(n/12) = -49/60 // + -49/60
(9*n)/10-(n/12)-(-49/60) = 0
(9*n)/10-(n/12)+49/60 = 0
49/60*n+49/60 = 0 // - 49/60
49/60*n = -49/60 // : 49/60
n = -49/60/49/60
n = -1
n = -1
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