Question

Find the value of x.

Answer 1

The value of X
X = -2.4

Answer 2

So you know that all the angles in a triangle must add up to 180. Therefore, you can make this equation:

`(-20x+3)+(-40x+18)+(-15x+9)=180`

And now just solve for x!

`-75x+30=180\\-75x=160\\x=(160)/(-75)\\x=-2.4`

So, your answer is:

x = -2.4