(4/5+1/6)*(23 2/3-15 5/9)*45/58 -1/2 (по действиям) help

(4/5+1/6)*(23 2/3-15 5/9)*45/58 -1/2=5 7/12
1. 4/5+1/6=(24+5)/30=29/30
2. 23 2/3-15 5/9= 71/3-140/9=(213-140)/9=73/9
3. 29/30*73/9=2117/270
4.2117/270*45/58=73/12
5. 73/12-1/2=(73-6)/12=67/12= 5 7/12