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