Question

find the value of x.​

Answer 1

Answer: x = 20

Steps:
5x = 100°
x = 100/5
x = 20

Answer 2

So these are vertical angles (share a vertex) which means they are the same measure. Set them equal to each other to find x

$(5x) = 100$

$\frac{5x}{5} = \frac{100}{5}$

$x = \frac{100}{5}$

Answer:

$x = 20$