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m in (-oo:+oo)
16/18 = m/13 // - m/13
16/18-(m/13) = 0
8/9-1/13*m = 0 // - 8/9
-1/13*m = -8/9 // : -1/13
m = -8/9/(-1/13)
m = 104/9
m = 104/9
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