(4 4/9-3 4/15):38+4.2•5/7=

= ((4-3) + (4/9-4/15)):38+ 4 2/10 * 5/7=(1+(4/9 * 5 - 4/15 * 3))+42/10 * 5/7=
(1+(20/45 - 12/45)) :38  + 3=(1+8/45):38+3=8/45:38+3=8/45 * 1/38+3=3 4/855