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M in (-oo:+oo)
M/26 = -1/6 // + -1/6
M/26-(-1/6) = 0
M/26+1/6 = 0
1/26*M+1/6 = 0 // - 1/6
1/26*M = -1/6 // : 1/26
M = -1/6/1/26
M = -13/3
M = -13/3
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