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Answer:
Step-by-step explanation:
x + 85 +28 = 180 {Sum of angles of a triangle}
x + 113 = 180
x = 180 - 113
x = 67
x + y = 180 {Linear pair}
67 + y = 180
y = 180 - 67
y = 113
15 + y + z = 180
15 +113 + z = 180
128 +z = 180
z = 180 - 128
z = 52