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