$\frac{340}{567} + \frac{29}{42} + \frac{43}{54} + \frac{74}{81} - (\frac{53}{60} - \frac{37}{84}) - (\frac{3}{14} + \frac{12}{35}) = (\frac{340}{567} + \frac{74}{81}) + (\frac{29}{42}) - (\frac{53}{60} - \frac{37}{84}) - (\frac{3}{14} + \frac{12}{35}) = \frac{340 + 74 * 7}{567} + \frac{29 * 9 + 43 * 7}{378} - \frac{53 * 7 - 37 * 5}{420} - \frac{3 * 5 + 12 * 2}{70} = \frac{340 + 518}{567} + \frac{261 + 301}{378} - \frac{371 - 185}{420} - \frac{15 + 24}{70} = \frac{858}{567} + \frac{562}{378} - \frac{186}{420} - \frac{39}{70} = \frac{286}{189} + \frac{281}{189} - \frac{31}{70} - \frac{39}{70} = \frac{286 + 281}{189} - \frac{31}{70} - \frac{39}{70} = 3 - \frac{31}{70} - \frac{39}{70} = 2\frac{70}{70} - \frac{31}{70} - \frac{39}{70} = 2\frac{39}{70} - \frac{39}{70} = 2$