1. The problem is to fill in the blanks and simplify the given expression or equation. Since no specific expression is provided, let's consider a general approach to simplifying algebraic expressions. 2. The formula or rule used for simplification involves combining like terms, applying distributive property, and reducing fractions if any. 3. Important rules: - Combine terms with the same variable and exponent. - Use distributive property: $a(b+c) = ab + ac$. - Simplify fractions by canceling common factors. 4. Example: Simplify $2x + 3x - 4 + 6$. 5. Combine like terms: $$2x + 3x = 5x$$ $$-4 + 6 = 2$$ 6. So, the simplified expression is: $$5x + 2$$ Since no specific expression was given, this is a general method to fill in blanks and simplify expressions.