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m in (-oo:+oo)
-(5*m)-1 = -16 // + 16
16-(5*m)-1 = 0
16-5*m-1 = 0
15-5*m = 0 // - 15
-5*m = -15 // : -5
m = -15/(-5)
m = 3
m = 3
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