2) \( \left(8 \times 10^{6}\right)+\left(12 \times 10^{6}\right)-\left(5 \times 10^{6}\right) \)

To arrive at the solution, let's break it down step-by-step. First, we combine the terms: \[ (8 \times 10^{6}) + (12 \times 10^{6}) = 20 \times 10^{6} \] Next, we subtract the third term: \[ 20 \times 10^{6} - (5 \times 10^{6}) = 15 \times 10^{6} \] Thus, the final answer is: \[ \boxed{15 \times 10^{6}} \]