$\lim_{x\to-\infty}\left(\frac{2x+7}{2x-6}\right)^{\sqrt{4x^2+x-3}}$
$64-a^8$
$2\left(5-4y\right)$
$x^2-10x$
$2^{19\:+\:2^{20}}$
$a^2+9a+20;\:x=2$
$6n^4\:-\:12n^2\:+\:6$
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