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m in (-oo:+oo)
7/13 = m/16 // - m/16
7/13-(m/16) = 0
7/13-1/16*m = 0 // - 7/13
-1/16*m = -7/13 // : -1/16
m = -7/13/(-1/16)
m = 112/13
m = 112/13
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