1) (x - 16) * 9 = 126
9х - 144 = 126
9х = 126 + 144
9х = 270
х = 30
2) 28 * (х + 5) = 224
28х + 140 = 224
28х = 224 - 140
28х = 84
х = 3
3) (х + 76) : 7 = 15
х + 76 = 105
х = 105 - 76
х = 29
4) 144 : (х - 3) = 36
144 = 36 (х - 3)
144 = 36х - 108
36х = 144 + 108
36х = 252
х = 7
5) 21 * (у - 8) = 84
у - 8 = 4
у = 12
6) (х + 67) : 18 = 4
х + 67 = 72
х = 5