Answer: X = 121
First, you need to find the total degrees within this shape: the equation is 180(n-2), where n is the number of points the shape has.
So for this shape: 180(7-2) = 900
Now you add all the given angles together, and subtract the sum from 900 to get x:
900 - (140+133+145+117+119+125)
900 - 779 = 121
X = 121 degrees
