Resposta :
A) 5x - 8y + 3z + 9x - 2y + 2
14 x 10y + 4z = 2 (7x - 5y + 2z)
B) - 4a + 9b - c - 8a + b + 6c
- 12a + 9b - c + b +6c = - 12a + 10b +5c
C) 5x - y - 10 + 10 + 6y
5x - y + 6y = 5x + 5y
A) 5x - 8y + 3z + 9x - 2y + 2
14 x 10y + 4z = 2 (7x - 5y + 2z)
B) - 4a + 9b - c - 8a + b + 6c
- 12a + 9b - c + b +6c = - 12a + 10b +5c
C) 5x - y - 10 + 10 + 6y
5x - y + 6y = 5x + 5y