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m in (-oo:+oo)
-(4*m)-8 = -4 // + 4
4-(4*m)-8 = 0
4-4*m-8 = 0
-4*m-4 = 0 // + 4
-4*m = 4 // : -4
m = 4/(-4)
m = -1
m = -1
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