$4+-3^2+2+-3+3$
$\int x^2udx$
$\frac{7x}{x-4}+\frac{x+7}{x-6}$
$9+1024+16+1+64$
$\lim_{x\to\infty}\left(\frac{\sqrt{2x+1}}{x+4}\right)$
$x+40=2x+10$
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