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M in (-oo:+oo)
-4 = -((1/2)*M)-12 // + -((1/2)*M)-12
(1/2)*M-4+12 = 0
1/2*M+8 = 0 // - 8
1/2*M = -8 // : 1/2
M = -8/1/2
M = -16
M = -16
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