4•х-(8000-3567)-(2031-1598)=400

Solve step by step:

• 8000 − 3567 = 4433
• 2031 − 1598 = 433

Thus: 4x − 4433 − 433 = 400 => 4x − 4866 = 400 => 4x = 400 + 4866 = 5266 => x = 5266 / 4 = 2633/2 = 1316.5

Answer: x = 1316.5 (or x = 2633/2).