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m in (-oo:+oo)
8/12 = m/15 // - m/15
8/12-(m/15) = 0
2/3-1/15*m = 0 // - 2/3
-1/15*m = -2/3 // : -1/15
m = -2/3/(-1/15)
m = 10
m = 10
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