20.0
Now think of it as 200 - 23 , which is 177
Re-inserting the decimal point , it is
17.7
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-20
Exterior angles = 180 - 177 ie 3o; Number of sides = 360/exterior angle = 360/3 = 20.
-x + 7 = 27 Subtract 7 from both sides: -x = 20 or x = -20
12
20