## Simplifying the Expression (x²y - 3y² + 5xy²) - (-x²y + 3xy² - 3y²)

This expression involves combining like terms within parentheses. Let's break down the steps:

**1. Distribute the negative sign:**

Remember that subtracting a quantity is the same as adding its negative. Therefore, we can rewrite the expression as:

(x²y - 3y² + 5xy²) **+** (x²y - 3xy² + 3y²)

**2. Combine like terms:**

Identify terms with the same variables and exponents. For instance, x²y and x²y are like terms.

**x²y**terms: x²y + x²y =**2x²y****xy²**terms: 5xy² - 3xy² =**2xy²****y²**terms: -3y² + 3y² =**0**

**3. Simplify the expression:**

Combining the simplified terms, the final simplified expression is:

**2x²y + 2xy²**

**Therefore, the simplified form of (x²y - 3y² + 5xy²) - (-x²y + 3xy² - 3y²) is 2x²y + 2xy².**