Simple calculation of 5 / 12-7 / 9 * 5 / 12 and 2 / 5 * 4 + 2 / 5

Simple calculation of 5 / 12-7 / 9 * 5 / 12 and 2 / 5 * 4 + 2 / 5

5/12(1-7/9)=5/54
2/5(1+4)=2