$16 x^{2}+8 x-6 x-3$

Step 1 ：Simplify the given expression by combining like terms: $16x^2 + 8x - 6x - 3$

Step 2 ：Combine the like terms: $16x^2 + (8x - 6x) - 3$

Step 3 ：Calculate the result: $16x^2 + 2x - 3$

Step 4 ：\(\boxed{16x^2 + 2x - 3}\)