1)
(х-16)*9=126
x - 16 = 126 : 9
x - 16 = 14
x = 14 +16
x = 30
2)
28*(х+5)=224
x + 5 = 224 : 28
x + 5 = 8
x = 8 - 5
x = 3
3)
(х+76):7=15
x + 76 = 15 * 7
x + 76 = 105
x = 105 - 76
x = 29
4)
144:(х-3)=36
x - 3 = 144 : 36
x - 3 = 4
x = 4 + 3
x = 7
5)
21*(у-8)=84
y - 8 = 84 : 21
y - 8 = 4
y = 4 + 8
y = 12
6)
(х+67):18=4
x + 67 = 4 * 18
x + 67 = 72
x = 72 - 67
x = 5