$8\left(2a-4\right)$
$a^2-1=2a$
$2x^2+12x+16$
$-2\cdot\left(-6\right)^2+-4$
$-\left(-9\right)+15:3$
$6x^2+6x+15x+15$
$x^3-4x^2-x$
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