Answer:
x = 25
Step-by-step explanation:
I added a drawing down below to guide you through!
First, we should remember, that if a line crosses two parallel lines, then the adjacent angles will have the same value. Since Line D and Line E are parallel and line BC is crossing it, angles ABC and 105 will be the same.
Now that we know one of the missing angles, we can find x easily!
All angles in a triangle add up to 180, so in this case, the equation will be: 50 + 105 + x = 180.
155 + x = 180
x = 25.
So x will equal to 25 degrees!