$x+20=50$
$a+1\:\cdot\:a+2$
$x^2+6x=3$
$\frac{\theta}{cscthet}$
$\lim_{x\to2}\left(\frac{1-\frac{1}{8}x^4}{\frac{1}{2}x^2-\frac{1}{8}x^4}\right)$
$52\cdot54$
$9x^4-36x^2y+36y^2$
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