Apply the distributive property: 3(2a−4b)3(2a - 4b)3(2a−4b).
6a−4b6a - 4b6a−4b
6a−12b6a - 12b6a−12b
5a−7b5a - 7b5a−7b
6a+12b6a + 12b6a+12b