66:(498+8767)-345

Interpret 66:(498+8767)-345 as 66 ÷ (498+8767) - 345.

• 498 + 8767 = 9265
• 66/9265 - 345 = (66 - 345×9265)/9265 = -3,196,359/9,265

Approximate decimal: -3,196,359 / 9,265 ≈ -344.9929.