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m in (-oo:+oo)
10/12 = m/13 // - m/13
10/12-(m/13) = 0
5/6-1/13*m = 0 // - 5/6
-1/13*m = -5/6 // : -1/13
m = -5/6/(-1/13)
m = 65/6
m = 65/6
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