(x-16)×9 = 126 28×(x+5) = 224 (x+76):7 = 15​

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