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 * (3 х - 16) = 238

3 х - 16 = 238 : 17

3 х - 16 = 14

3 х = 14 + 16

3 х = 30

х = 30 : 3

х = 10

проверка:

17 * (3 * 10 - 16) = 238

17 * (30 - 16) = 238

17 * 14 = 238

238 = 238