$x^2+x\:=\:42$
$\lim x\to-3\:\left(\left(x^2\right)\right)$
$\frac{x^6-y^6}{x^2+y^2}$
$a\left(b+c-d\right)$
$\lim_{x\to0}\left(\frac{sin\left(\pi x\right)}{x^2}\right)$
$\frac{x^2-3x+3}{x+1}$
$7-\left(10-5\right)$
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