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m in (-oo:+oo)
6-(2*m) = m-12 // - m-12
6-(2*m)-m+12 = 0
6-2*m-m+12 = 0
18-3*m = 0 // - 18
-3*m = -18 // : -3
m = -18/(-3)
m = 6
m = 6
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