x
 = 
8
2
x

Cross multiply:
x * x = 2 * 8

Simplifying
x * x = 2 * 8

Multiply x * x
x2 = 2 * 8

Multiply 2 * 8
x2 = 16

Solving
x2 = 16

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}