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-2(m + 6m) - 6 = - 4(m +6) - 4m
-2m - 12m - 6 = - 4m - 24 - 4m
-14m - 6 = - 8m - 24
24 - 6 = - 8m + 14m
18 = 6m
18/6 = m
3 = m
m = 3
Solucion.
m = 3