(d - 389)*3=807 8*(5400-s)=5536 t: (6400-6393)=8500 (119+h): 8=765

1) (d-389)×3=807
d-389=807÷3
d-389=269
d=269+389
d=658

2) 8×(5400-s)=5536
5400-s=5536÷8
5400-s=692
-s=692-5400
-s=-4708
s=4708

3) t÷(6400-6393)=8500
t÷7=8500
t=8500×7
t=59500

4) (119+h)÷8=765
119+h=765×8
119+h=6120
h=6120-119
h=6001