Answer:
Step-by-step explanation:
(3x + 5y + 12) + (2x - y) +(9x + 2y-2)
= 3x + 5y + 12 + 2x - y + 9x + 2y - 2 {Bring like terms together}
= 3x + 2x + 9x +5y -y + 2y + 12 -2
= 14x + 6y +10
