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m in (-oo:+oo)
3/6 = m/12 // - m/12
3/6-(m/12) = 0
1/2-1/12*m = 0 // - 1/2
-1/12*m = -1/2 // : -1/12
m = -1/2/(-1/12)
m = 6
m = 6
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