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m in (-oo:+oo)
4/3 = m/12 // - m/12
4/3-(m/12) = 0
4/3-1/12*m = 0 // - 4/3
-1/12*m = -4/3 // : -1/12
m = -4/3/(-1/12)
m = 16
m = 16
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