Respuesta :

spy061
Since the angles of a triangle add up to 360 degrees, all you need to do is to add the expressions together and equal them to 360. Then solve for x. x on this case equals 57

Answer:

x = 27

Step-by-step 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 )

x = 27