Solution:
1. Distribute the 7 to each term inside the parentheses:
- Multiply 7 by 3x:
7 \cdot 3x = 21x
- Multiply 7 by -4y:
7 \cdot (-4y) = -28y
- Multiply 7 by 2:
7 \cdot 2 = 14
2. Combine the results:
- The simplified expression is:
21x - 28y + 14
Therefore, the simplified expression is:
21x - 28y + 14