240: (х+3) - 5=7

16 * (11-х: 8) = 64

1) 240 / (х + 3) - 5 = 7

240 / (х + 3) = 7 + 5

240 / (х + 3) = 12

х + 3 = 240 / 12

х + 3 = 20

х = 20 - 3

х = 17

2) 16 * (11 - х / 8) = 64

16 * 11 - 16 * х / 8 = 64

176 - 2 х = 64

- 2 х = - 176 - 64

-2 х = - 112

х = 56

2) 16 * (11-x/8) = 64;

16 * ((88-x) / 8) = 64;

2 * (88-x) = 64;

176-2*x=64;

-2*x=-112;

x=56;