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m in (-oo:+oo)
8-((1/2)*m) = 2 // - 2
8-((1/2)*m)-2 = 0
(-1/2)*m-2+8 = 0
6-1/2*m = 0 // - 6
-1/2*m = -6 // : -1/2
m = -6/(-1/2)
m = 12
m = 12
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