74,4x2/21+(-105,3)x2/3/7 -(-105,3)2/21x74,7=
1. 74,4*2:21 = 7,086 2. -105,3*2:3:7 = -10,03 3. -105,3*2:21*74,7 = 749,134 4. 7,086 + (-10,03) - (749,134) = 746,19