Actually Welcome to the Concept of the Angle sum property of a Triangle.
hence,
==> 4x + 8° + 60° + 60° = 180
==> 4x + 128° = 180°
==> 4x = 180 - 128
==> 4x = 52°
==> x = 52/4
==> x = 13°
hence the value of x = 13 °
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