Answer:
x = 4, z = 62
Explanation:
z and 62 are vertical angles and congruent, hence
z = 62
z and 15x + 58 form a straight angle and are supplementary, hence
15x + 58 + z = 180, that is
15x + 58 + 62 = 180
15x + 120 = 180 ( subtract 120 from both sides )
15x = 60 ( divide both sides by 15 )
x = 4