So for a shape with a certain amount of sides, there will always be a fixed number for the internal angles.
For example, a triangle must have 180 degrees of internal angles.
A square must have 360.
The formula therefore is, (if s equals the side number)
180(s - 2)
And s here is 6
So,
180 * 4
Or, 720
So all those numbers need to add up to 720.
So we can just add up these.
160 + 75 + 108 + 113 + 132
Or, 588.
Now since we know they have to add up to 720, but we only have 588, we need to figure out how much more we need.
720 - 588 = 132
So x = 132.