Икс+273-54=648+254

432 + (808x иск) = 4096:2

(989-154) - икс=142x3

1) Х + 273-54 = 648+254

Х = (648+254) - (273-54)

Х = 902 - 219

Х = 683

2) 432 + (808*Х) = 4096:2

808*Х = (4096:2) - 432

808*Х = 1616

Х = 1616:808

Х = 2

3) (989-154) - Х=142*3

Х = (989-164) - (142*3)

Х = 825 - 426

Х = 399