The value of x in the triangle is 40 degrees.
The angle x can be found as follows:
x + (4x - 20) = 180(angle on a straight line)
x + (4x - 20) = 180
x + 4x - 20 = 180
5x - 20 = 180
add 20 to both sides
5x = 180 + 20
5x = 200
x = 200 / 5
x = 40°
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