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m in (-oo:+oo)
-(6*m)-(2*m)-2 = -82 // + 82
82-(6*m)-(2*m)-2 = 0
82-6*m-2*m-2 = 0
80-8*m = 0 // - 80
-8*m = -80 // : -8
m = -80/(-8)
m = 10
m = 10
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