4 3/4-(x-2 5/8)=3 5/6 9 9/28-(4 5/21-x)=6 2/7

а) 4 3/4 - (x - 2 5/8) = 3 5/6;4 3/4 - х + 2 5/8 = 3 5/6;4 3/4 + 2 5/8 - 3 5/6 = х;19/4 + 21/8 - 23/6 = х;114/24 + 63/24 - 92/24 = х;(114 + 63 - 92)/24 = х;85/24 = х;3 13/24 = х;Проверка.4 3/4 - х + 2 5/8 = 3 5/6;19/4 - 85/24 + 21/8 = 3 5/6;114/24 - 85/24 + 63/24 = 3 5/6;92/24 =3 5/6;3 20/24 = 3 5/6;3 5/6 = 3 5/6;Уравнение решено правильно.б) 9 9/28 - (4 5/21 - x) = 6 2/7;261/28 - 89/21 + х = 44/7;х = 44/7 - 261/28 + 89/21;х = 528/84 - 783/84 + 356/84;х = 101/84 = 1 17/84;Проверка.261/28 - 89/21 + 101/84 = 6 2/7;783/84 - 356/84 + 101/84 = 6 2/7;528/84 = 6 2/7;6 24/84 = 6 2/7;6 2/7 = 6 2/7;Уравнение решено правильно.