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m in (-oo:+oo)
-6*m-(2*m)-2 = 86 // - 86
-6*m-(2*m)-86-2 = 0
-6*m-2*m-86-2 = 0
-8*m-88 = 0 // + 88
-8*m = 88 // : -8
m = 88/(-8)
m = -11
m = -11
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