1) (х - 16) * 9 = 126
х - 16 = 126 : 9
х - 16 = 14
х = 16 + 14
х = 30
2) 28 * (х + 5) = 224
х + 5 = 224 : 28
х + 5 = 8
х = 8 - 5
х = 3
3) (х + 76) : 7 = 15
х + 76 = 15 * 7
х + 76 = 105
х = 105 - 76
х = 29
(x-16)×9=126 28×(x+5)=224 (x+76):7=15
x-16=126:9 x+5=224:28 x+76=15×7
x-16=14 x+5=8 x+76=105
x=16+14 x=8-5 x=105-76
x=39 x=3 x=29
