2 4(8a-9b)-4 1(5b 6c)-1 9(-4a 7c) July 8, 2019 16 32 64 128 2 4(8a-9b)-4 1(5b+6c)-1 9(-4a+7c) 2 4(8а-9b)-4 1(5b+6c)-1 9(-4a+7c) 2 8(5b - 6c) - (7b - 8a) * 1 2 2 5(4a-8b)-(3a-4b)•1 4