$\frac{3}{4}a^3-\left\{7\right\}$
$\left(\frac{4^{-2}}{3^{-5}}\right)^{-x}$
$9a\left(m+n\right)-15ay\left(m+n\right)-5y\left(m+n\right)$
$49k^2-28k+4$
$\lim_{x\to-\pi}\frac{\sin\left(x\right)}{\cos\left(x+\frac{\pi}{2}\right)}$
$48x+18x^2-3x^3$
$4x-3>1$
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