simplify: 3a to the 3rd power times b to the 2nd power + 5a to the second power times b to the second power minus 14ab to the second power minus 3a to the third power times b to the second power

simplify: 3a to the 3rd power times b to the 2nd power + 5a to the second power times b to the second power minus 14ab to the second power minus 3a to the third power times b to the second power

Are you sure this is right? The first and last terms are identical.