Упростите : 2/7(4 2/3m - 1,4) - 2/9(6m + 2,7)

2/7 * (4 2/3 * m - 1,4) - 2/9 * (6 * m + 2,7) = 2/7 * ((4 * 3 + 2)/3 * m - 14/10) - 2/9 * (6 * m + 27/10) = 2/7 * (14/3 * m - 7/5) - 2/9 * (6 * m + 27/10) = 2/7 * 14/3 * m - 2/7 * 7/5 - 2/9 * 6 * m + 2/9 * 27/10 = 4/3 * m - 2/5 - 4/3 * m + 3/5 = 1/5.

Ответ: 1/5.