Science and Mathematics for Engineering 6th Edition by John Bird

Exercise 18

$$\text { Simplify: } \left\{ \frac { 1 } { 13 } \text { of } \left( 2 \frac { 9 } { 10 } - 1 \frac { 3 } { 5 } \right) \right\} + \left( 2 \frac { 1 } { 3 } \div \frac { 2 } { 3 } \right) - \frac { 3 } { 4 }$$