x = 8
x = 9
x = 14
x = 15

Answer:
x = 8
Step-by-step explanation:
The angles 75° and (5x + 35)° are vertical angles and congruent, thus
5x + 35 = 75 ( subtract 35 from both sides )
5x = 40 ( divide both sides by 5 )
x = 8