Answer:
x = 27
Explanation:
The sum of the 3 angles in a triangle = 180°
Sum the 3 angles and equate to 180
3x - 17 + 2x - 5 + x + 40 = 180
6x + 18 = 180 ( subtract 18 from both sides )
6x = 162 ( divide both sides by 6 )
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