Step 1:
First, we distribute the negative sign in the inner parentheses of the first bracket:
$$
\left[2 n^{2}-\left(2 n^{2}-n+5\right)\right]+\left[3 n^{2}+\left(n^{2}-2 n-7\right)\right] = \left[2 n^{2} - 2 n^{2} + n - 5\right] + \left[3 n^{2} + n^{2} - 2 n -
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