1)19-2(3х+8)=2х-37 2)8х+3(7-2х)=4х+3 3)23-4(3х+8)=1-17х

1) 19 - 2 * (3х + 8) = 2х - 37 19 - 6х - 16 = 2х - 37 3 - 6 х = 2х - 37 3 + 37 = 2х + 6х 40 = 8х 8х = 40 х = 40 : 8 х = 5 проверка: 19 - 2 * (3 * 5 + 8) = 2 * 5 - 37 19 - 30 - 16 = 10 - 37 -27 = -27 2) 8х + 3 * (7 - 2х) = 4х + 3 8х + 21 - 6х = 4х + 3 21 - 3 = 4х + 6х - 8х 18 = 2х 2х = 18 х = 18 : 2 х = 9 проверка: 8 * 9 + 3 * (7 - 2 * 9) = 4 * 9 + 3 72 + 21 - 54 = 36 + 3 39 = 39 3) 23 - 4 * (3х + 8) = 1 - 17х 23 - 12х - 32 = 1 - 17х -12х + 17х = 1 + 32 - 23 5х = 10 х = 10 : 5 х = 2 проверка: 23 - 4 * (3 * 2 + 8) = 1 - 17 * 2 23 - 24 - 32 = 1 - 34 -33 = -33