Let's solve each equation step by step:

1) 800 - 46Х = 156
Subtract 800 from both sides:
-46Х = -644
Divide by -46:
Х = 14

2) 48Х - 568 = 1192
Add 568 to both sides:
48Х = 1760
Divide by 48:
Х = 36.67 (rounded to two decimal places)

3) (764 - 436) / Х = 5904
Subtract 436 from 764:
328 / Х = 5904
Multiply both sides by Х:
328 = 5904*Х
Divide by 5904:
Х = 0.0556 (rounded to four decimal places)

Therefore, the solutions to the equations are:
1) Х = 14
2) Х = 36.67
3) Х = 0.0556