Answer:
[tex]x[/tex] = 67°
Step-by-step explanation:
As we can see in the diagram, ∠[tex]x[/tex] and the 78° angle together make up the 145° angle.
∴ [tex]x[/tex] + 78° = 145°
⇒ [tex]x[/tex] = 145° - 78°
⇒ [tex]x[/tex] = 67°
