( 100 - 28 ) : ( 45 - 38 ) + ( 4 × 8 + 9 × 5 ) : 7 =
72 : 7 + ( 32 + 45 ) : 7 =
10, 2857 + 77 : 7 =
10, 2857 + 11 = 21, 2857
