$$( 8 x - 6 ) - ( 3 x ^ { 2 } + 12 ) ^ { 2 }$$
$-9\left(x^{2}+4\right)^{2}+8x-6$
$$8x-6-\left(9\left(x^{2}\right)^{2}+72x^{2}+144\right)$$
$$8x-6-\left(9x^{4}+72x^{2}+144\right)$$
$$8x-6-9x^{4}-72x^{2}-144$$
$$8x-150-9x^{4}-72x^{2}$$
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$-9x^{4}-72x^{2}+8x-150$
