1) 7(x-9)=63 2) 17(3x16)=238

1) 7 * (х - 9) = 63 х - 9 = 63 : 7 х - 9 = 9 х = 9 + 9 х = 18 проверка: 7 * (18 - 9) = 63 7 * 9 = 63 63 = 63 2) 17 * (3х - 16) = 238 3х - 16 = 238 : 17 3х - 16 = 14 3х = 14 + 16 3х = 30 х = 30 : 3 х = 10 проверка: 17 * (3 * 10 - 16) = 238 17 * (30 - 16) = 238 17 * 14 = 238 238 = 238