(29 - х): 3 - 1 = 6(29 - х): 3 = 6 + 1(29 - х) : 3 = 729 - х = 7 * 329 - х = 21х = 29 - 21х = 8----------------------------------(29 - 8) : 3 - 1 = 621 : 3 - 1 =67 - 1 = 66 = 6-4х - 8(9 - 2х)= - 4х - 8*9 - 8 *(-2х) = - 4х -72 + 16х = = (16х - 4х) - 72 = 12х -72 = можно еще вынести общий множитель:= 12(х - 6)6(3х-2)+4(5х-1) = 6*3х + 6*(-2) + 4*5х + 4*(-1) == 18х - 12 + 20х - 4 = (18х +20х) - (12 + 4) == 38х - 16 == 2(19х - 8)-6(8а-2b) +(3a-7b)*2 = -6*8a - 6*(-2b) + 3a*2 -7b * 2 == -48a + 12b + 6a - 14b = - (48a - 6a) - (14b - 12b) == - 42a -2b == - 2(21a +b)4(8t+7) - 16(2t-3) = 4*8t + 4*7 - 16*2t - 16*(-3) == 32t + 28 - 32t + 48 = 28 + 48 = 76