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

1) 4/5+ 1/6 = (4*6+1*5)/5*6 = (24+5)/30 = 29/30
2) 23 2/3 - 15 5/9 = (23*3+2)/3 - (15*9+5)/9 = 71/3 - 140/9 = (71*3 - 140)/9 = (213-140)/9 = 73/9
дальше непонятно действие между скобок