8
 = 
x
12
3

Cross multiply:
8 * 3 = 12 * x

Simplifying
8 * 3 = 12 * x

Multiply 8 * 3
24 = 12 * x

Solving
24 = 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
24 + -12x = 12x + -12x

Combine like terms: 12x + -12x = 0
24 + -12x = 0

Add '-24' to each side of the equation.
24 + -24 + -12x = 0 + -24

Combine like terms: 24 + -24 = 0
0 + -12x = 0 + -24
-12x = 0 + -24

Combine like terms: 0 + -24 = -24
-12x = -24

Divide each side by '-12'.
x = 2

Simplifying
x = 2