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M in (-oo:+oo)
M/28 = 56/98 // - 56/98
M/28-(56/98) = 0
M/28-4/7 = 0
1/28*M-4/7 = 0 // + 4/7
1/28*M = 4/7 // : 1/28
M = 4/7/1/28
M = 16
M = 16
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