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M in (-oo:+oo)
M/26 = -1/2 // + -1/2
M/26-(-1/2) = 0
M/26+1/2 = 0
1/26*M+1/2 = 0 // - 1/2
1/26*M = -1/2 // : 1/26
M = -1/2/1/26
M = -13
M = -13
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