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M in (-oo:+oo)
M/8 = 13/2 // - 13/2
M/8-(13/2) = 0
M/8-13/2 = 0
1/8*M-13/2 = 0 // + 13/2
1/8*M = 13/2 // : 1/8
M = 13/2/1/8
M = 52
M = 52
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