$\frac{2}{\sqrt{x+6}}$
$-22=4x-x+2$
$18.24\cdot0.1$
$-a^2b+\frac{3}{12}a^2b$
$-7n+2n-5n$
$\frac{8x^3-4x^2-2x-5}{2x-1}$
$\lim_{x\to\infty}\left(2xsin\left(\frac{2\pi}{2x}\right)\right)$
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