Explanation:
due to the rules of crossing lines, z = 5x + 69
and all angles on one side of a line sum up to 180 degrees.
so,
5x + 69 + 15x - 29 = 180
20x + 40 = 180
x + 2 = 9
x = 7
z = 5x + 69 = 5×7 + 69 = 35 + 69 = 104 degrees
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