Respuesta :
Answer:
D
Step-by-step explanation:
8x-5x+3+9=3x+12
combine like terms
So in algebra you always add letter separately and number separately
8x-5x=3x
3+9=12
So the answer would be:
3x+12
So D
8x-5x=3x
3+9=12
So the answer would be:
3x+12
So D