Х - 3 5/6 + 2 3/5 = 5 2/3
Х - 3 5/6 = 5 2/3 - 2 3/5
Х - 3 5/6 = 3 1/15
Х = 3 1/15 + 3 5/6
Х = 6 27/ 30 или 6 9/10
проверяем: 6 27/30 - 3 5/6 + 2 3/ 5 = 3 2/30 + 2 3/5 = 5 20/30 = 5 2/3 все верно.
3 × 2 7/15 - 5 1/2 × 7/9 + 1 7/48 × 2 2/11 - 2/5 × 6 5/9 = 3
666*8=5328
108/8*1000=1963
5328-1963=3365