How do I solve this?

36

Step-by-step explanation:

Here,

24 and 2x + 18 are interior angles of the triangle.

3x + 6 is the exterior angle of the triangle.

Formula : -

Exterior angle of the triangle

= Sum of two interior angles.

3x + 6 = 24 + 2x + 18

3x + 6 = 2x + 24 + 18

3x + 6 = 2x + 42

Bring variables to the left side while the numbers towards the right.

3x - 2x = 42 - 6

x = 36

Therefore,

the value of x is 36.

b

step-by-step explanation:

b