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

(4/5+1/6)*(23 2/3-15 5/9)*45/58-1/2= 4/5+1/6=(24+5)/30=29/30 23 2/3-15 5/9= 71/3-140/9=(213-140)/9=73/9 29/30*73/9=2117/270 2117/270*45/58=2117/348 2117/348-1/2=(2117-174)/348=1943/348=5 203/348