1) 19.2a - 21.6b - 5b - 6.6c + 7.4a - 12.3c = 26.6a - 26.6b - 18.9c
2) 19.8x - 36.3y + 16.8y - 21z + 4.2x - 3.5z = 23x - 19.5y - 24.5z
1) 19.2a - 21.6b - 5b - 6.6c + 7.4a - 12.3c = 26.6a - 26.6b - 18.9c
2) 19.8x - 36.3y + 16.8y - 21z + 4.2x - 3.5z = 23x - 19.5y - 24.5z