$\frac{3}{4}x+4=22$
$4-3x>4$
$ab-3bc-2a+bc$
$\int\frac{x+1}{\left(4x^2-1\right)\left(4+9x^2\right)}dx$
$20+90+51\infty$
$\lim_{x\to1.99}\left(\frac{x-2}{x^2-4}\right)$
$x-x+16x$
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