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m in (-oo:+oo)
4/5 = m/15 // - m/15
4/5-(m/15) = 0
4/5-1/15*m = 0 // - 4/5
-1/15*m = -4/5 // : -1/15
m = -4/5/(-1/15)
m = 12
m = 12
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