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m in (-oo:+oo)
-6 = m/5-3 // - m/5-3
3-(m/5)-6 = 0
-1/5*m-3 = 0 // + 3
-1/5*m = 3 // : -1/5
m = 3/(-1/5)
m = -15
m = -15
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