$$\left. \begin{array} { l } { x ^ { 2 } - b a c } \\ { + ( a ^ { 6 } + 2 a b ) } \\ { - a } \end{array} \right.$$
$-a\left(x^{2}-abc\right)\left(a^{5}+2b\right)$
$$-a\left(x^{2}-abc\right)\left(a^{5}+2b\right)$$
$$-x^{2}a^{6}-2abx^{2}+bca^{7}+2ca^{2}b^{2}$$
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$x^{2}-abc,\ a\left(a^{5}+2b\right),\ -a$