6+6:3

To solve the expression \( 6 + 6 : 3 \), you should follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right)).

1. First, perform the division: \[ 6 : 3 = 2 \]

2. Then, perform the addition: \[ 6 + 2 = 8 \]

So, \( 6 + 6 : 3 = 8 \).