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m in (-oo:+oo)
6/16 = m/40 // - m/40
6/16-(m/40) = 0
3/8-1/40*m = 0 // - 3/8
-1/40*m = -3/8 // : -1/40
m = -3/8/(-1/40)
m = 15
m = 15
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