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Americ
We know that angle 101 and its interior angle next to it will equal 180 because it's a straight line.

180-101= 79 degrees

Find 3rd angle of triangle.

180= 38+79+y
180= 117+y
Subtract 117 from both sides
63= y

That is the interior angle by x. X plus 63 also equal a line, or 180 degrees.

180= 63+ x
Subtract 63 from both sides
117= x

Hope this helps! :)
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