$-2x+3y=20$
$-\:6\left(5m+3\right)$
$\frac{dx}{dy}=\frac{x^2+1}{2xy}$
$\left(8z-4\right)+\left(8z-4\right)$
$-8a^4-3a^4$
$\lim_{x\to5}\left(\sqrt{x+4}\right)$
$8cos^2-8sin^2=16cos^2-8$
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