Answer:
x=25
Step-by-step explanation:
angles are vertical angles so they are equal
set expressions equal to each other: 5x-10=3x+40
subtract 3x from both sides: 2x-10=40
add 10 to both sides: 2x=50
divide by 2: x=25
(5x-10)=(3x+40) because from what I understand they are vertical angles
5x-3x=40+10
2x=50
