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M in (-oo:+oo)
M/(-8) = -1.5 // + 1.5
M/(-8)+1.5 = 0
1.5-1/8*M = 0 // - 1.5
-1/8*M = -1.5 // : -1/8
M = -1.5/(-1/8)
M = 12
M = 12
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