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m in (-oo:+oo)
9/15 = m/25 // - m/25
9/15-(m/25) = 0
3/5-1/25*m = 0 // - 3/5
-1/25*m = -3/5 // : -1/25
m = -3/5/(-1/25)
m = 15
m = 15
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