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The value of x will be 100 degree.
Step-by-step explanation:
Look , if we draw a straight line from the vertex of 120 degrees to 140 degrees then it is going to form one side of a rectangle.
Now as rectangle has right angles so the remaining angles would be 30 degree and 50 degree and total angle sum in a triangle is 180 degrees so the remaining angle x will be 100 degrees.
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