\( 3 a^{2}-\left[6 a^{2}-\left\{8 b^{2}-\left(9 c^{2}-2 a^{2}\right)\right\}\right] \)
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\( 3 a^{2}-\left[6 a^{2}-\left\{8 b^{2}-\left(9 c^{2}-2 a^{2}\right)\right\}\right] \)
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