$\frac{x^2-6}{x}$
$5x^2y-15^4+75x^3y$
$a-\left[2b-\left\{3x-3a-\left(a-2b\right)\right\}+\left(a-b\right)\:\right]$
$\int2e^{3x^2}xdx$
$\lim_{x\to3}\left(\frac{2x^2+3x+1}{x^2-2x-3}\right)$
$\left(7w-9\right)^2$
$\left(x+2\right)\cdot\left(x-1\right)<16$
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