$78-\left(-13\right)$
$\frac{12x}{6x^2}$
$\left(m-5n\right)^2$
$7a^x-30a^x-41a^x-9a^x$
$\lim_{x\to\infty}\left(\frac{\left(7x-2\right)\left(6x-1\right)}{\left(4+3x^2\right)\left(4x-1\right)}\right)$
$\frac{x^6-1}{x+1}$
$4^23$
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