1. The problem is to simplify the expression 3mas7. 2. Since "3mas7" is not a standard mathematical expression, we interpret it as a typo or unclear input. 3. If you meant to add 3 and 7, the expression is $3 + 7$. 4. Using the addition formula: $a + b = c$, where $a=3$ and $b=7$. 5. Calculate $3 + 7 = 10$. 6. Therefore, the simplified result is $10$.