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m in (-oo:+oo)
(-1/2)*m-4 = -6 // + 6
(-1/2)*m-4+6 = 0
2-1/2*m = 0 // - 2
-1/2*m = -2 // : -1/2
m = -2/(-1/2)
m = 4
m = 4
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