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m in (-oo:+oo)
18/50 = m/15 // - m/15
18/50-(m/15) = 0
9/25-1/15*m = 0 // - 9/25
-1/15*m = -9/25 // : -1/15
m = -9/25/(-1/15)
m = 27/5
m = 27/5
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