Answer:
The value of x is 9.
Step-by-step explanation:
In order to find the value of x, we have to note that this is an equalateral triangle. Since all the sides are the same, that also means that all of the angles are the same. This means each angle is equal to 60 degrees. Knowing that, we can set the bottom left corner equal to 60 in order to find the value of x.
7x - 3 = 60
7x = 63
x = 9
