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m in (-oo:+oo)
17/10 = m/13 // - m/13
17/10-(m/13) = 0
17/10-1/13*m = 0 // - 17/10
-1/13*m = -17/10 // : -1/13
m = -17/10/(-1/13)
m = 221/10
m = 221/10
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