(12 5/12+1 2/3 - 3 5/6 + 2 3/4)*(2 1/2* 2/5-7/9)

Compute step by step.

First bracket: 12 5/12 + 1 2/3 − 3 5/6 + 2 3/4

• 12 5/12 = 149/12
• 1 2/3 = 5/3 = 20/12
• 3 5/6 = 23/6 = 46/12
• 2 3/4 = 11/4 = 33/12

Sum: 149/12 + 20/12 − 46/12 + 33/12 = (149+20−46+33)/12 = 156/12 = 13

Second bracket: 2 1/2 * 2/5 − 7/9

• 2 1/2 = 5/2
• (5/2)*(2/5) = 1
• 1 − 7/9 = 2/9

Product: 13 * (2/9) = 26/9 = 2 8/9

Final answer: 26/9 (or 2 8/9).