Respuesta :

yolandaam
5x+128 should be it. 65+75=140. 140-12=128. you can't do anything to the x because they're not common terms so you leave it at that.
5x + 65 + 75 - 12

We simplify this. 

5x+65+75-12
5x + 140 - 12
5x + 128

Answer: 5x + 128