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m in (-oo:+oo)
(13/12)*m = 1/9-(13/14) // - 1/9-(13/14)
(13/12)*m-(1/9)+13/14 = 0
(13/12)*m-1/9+13/14 = 0
13/12*m+103/126 = 0 // - 103/126
13/12*m = -103/126 // : 13/12
m = -103/126/13/12
m = -206/273
m = -206/273
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