Identify the like terms from the following, 3pqr,-6pq,9qr,-3pq,7pr x2y2z,xy2,xz2,y2x,zx2 7ab,8ba,2b,5a,4ac

Let's identify the like terms from the given expressions. Like terms are those terms that contain the same variables raised to the same powers, regardless of their coefficients.

### 1. **First set:**
   - \( 3pqr \)
   - \( -6pq \)
   - \( 9qr \)
   - \( -3pq \)
   - \( 7pr \)

- **Like terms:**
   - \( -6pq \) and \( -3pq \) (same variables: \( pq \))

### 2. **Second set:**
   - \( x^2y^2z \)
   - \( xy^2 \)
   - \( xz^2 \)
   - \( y^2x \)
   - \( zx^2 \)

- **Like terms:**
   - \( x^2y^2z \) (no like term)
   - \( xy^2 \) and \( y^2x \) (same variables: \( xy^2 \))
   - \( xz^2 \) and \( zx^2 \) (same variables: \( xz^2 \))

### 3. **Third set:**
   - \( 7ab \)
   - \( 8ba \)
   - \( 2b \)
   - \( 5a \)
   - \( 4ac \)

- **Like terms:**
   - \( 7ab \

Learn how to identify like terms in algebraic expressions. This problem covers basic algebraic concepts, focusing on identifying terms with the same variables raised to the same powers. Suitable for students in Grades 7-9.

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