Answer:
x=42because of 3x and f or g
Reason:
The angles shown must add to 180 degrees if we want the top and bottom lines to be parallel. These angles are same side interior angles.
(x+4)+(3x) = 180
4x+4 = 180
4x = 180-4
4x = 176
x = 176/4
x = 44
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