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