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m in (-oo:+oo)
8-(6*m) = 2*m-80 // - 2*m-80
8-(6*m)-(2*m)+80 = 0
8-6*m-2*m+80 = 0
88-8*m = 0 // - 88
-8*m = -88 // : -8
m = -88/(-8)
m = 11
m = 11
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