Answer:
x = 8
Step-by-step explanation:
Interior angles of a triangle always add up to 180 degrees.
50 + 76 + ? = 180
? = 180 - 126
? = 54
A straight line also is always 180 degrees.
54 + 15x + 6 = 180
15x = 180 - 60
15x = 120
x = 8
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