$\left(a^2+4\right)\left(a-2\right)\left(a+2\right)$
$\left(2x-1\right)\left(-x^{2}-5\right)\left(x^{3}-1\right)$
$-x^2+4x=x^2-8x+16$
$20+90+517c$
$\left(3+5x\right)^3$
$\frac{4}{5}\cdot\frac{25}{1}$
$-1^7$
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