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Skøll1922
Since it is a 90° angle it is equal to the sum of 6x° and 4x°, so 6+4=10 and the answer is the second one.
Adjacent angles on a straight line sum up to 180:
90 + 6x + 4x = 180

Combine like terms:
90 + 10x = 180

Subtract 90 from both sides:
10x = 90

Divide both sides by 10:
x = 9

Answer: 9