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m in (-oo:+oo)
m/13 = 21/39 // - 21/39
m/13-(21/39) = 0
m/13-7/13 = 0
1/13*m-7/13 = 0 // + 7/13
1/13*m = 7/13 // : 1/13
m = 7/13/1/13
m = 7
m = 7
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