-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
7
21
How about: 32+20 = 52
Let the unknown number be n.Then 20 x n = 177 : so n = 177 ÷ 20 = 8.85 or 817/20.
70
40
To convert from Kelvin to Celsius, you need to subtract 273.15. So, 20 Kelvin is equal to approximately -253.15 degrees Celsius.
82 subtract by 20 = 62
64
177/20
Subtract a negative 1. 19 - (-1) = 20
177/20