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m in (-oo:+oo)
7/14 = m/13 // - m/13
7/14-(m/13) = 0
1/2-1/13*m = 0 // - 1/2
-1/13*m = -1/2 // : -1/13
m = -1/2/(-1/13)
m = 13/2
m = 13/2
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