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m in (-oo:+oo)
(1/2)*(2-m) = -2 // + 2
(1/2)*(2-m)+2 = 0
1/2*(2-m)+2 = 0
1/2*(2-m)+2 = 0
3-1/2*m = 0
3-1/2*m = 0
3-1/2*m = 0 // - 3
-1/2*m = -3 // : -1/2
m = -3/(-1/2)
m = 6
m = 6
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