Answer:
45
Step-by-step explanation:
2x+45+x=180 simplify to 3x+45=180. Subtract 45 on both sides then divide by 3 to get 45
2x + 45 + x = 180 {linear pair}
3x + 45 = 180
3x = 180 -45
3x = 135
x = 135/3
x = 45
