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M in (-oo:+oo)
M/(-2) = -3/2 // + -3/2
M/(-2)-(-3/2) = 0
M/(-2)+3/2 = 0
3/2-1/2*M = 0 // - 3/2
-1/2*M = -3/2 // : -1/2
M = -3/2/(-1/2)
M = 3
M = 3
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