$5\left(+9+9\right)$
$7-\infty$
$16z^2-16z-5$
$10j+2\:\cdot\:10j+2$
$\frac{x^2+1}{x^2-4}$
$\lim_{x\to\pi}\frac{\left(\left|\sin\left(x\right)\right|\right)}{\left(\sin\left(x\right)\cdot\cos\left(x\right)\right)}$
$2x+7x-x-2y-3x-5$
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