$\left(a^x-3\right)\left(a^x+3\right)$
$\lim_{x\to4}\left(\frac{2\cdot\left(x-4\right)}{\sqrt{4-x}}\right)$
$\int\frac{1}{\left(-5-6x-x^2\right)^{\frac{5}{2}}}dx$
$6x+9x-20$
$7\left(13-2x\right)-9\left(x+10\right)$
$2x^2-32x^2$
$12-4.8$
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