2.9*(3.8-4/5)/(13/8+5/8)
= 2.9 * (38/10 - 8/10) / ((13 + 5)/8)
= 2.9 * 3 / (18/8)
= 2.9 * 3 * 8/18
= 2.9 * 8/6
= 29/10 * 4/3
= 29*4 / 30
= 116/30
= 58/15