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m in (-oo:+oo)
13/2 = m/14 // - m/14
13/2-(m/14) = 0
13/2-1/14*m = 0 // - 13/2
-1/14*m = -13/2 // : -1/14
m = -13/2/(-1/14)
m = 91
m = 91
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