$\left(x^{2}+5x+7\right):\left(2+x\right)$
$9^2-2^4$
$2x+3\cdot2x-3$
$\lim_{h\to0}\left(\frac{sin\left(\pi h\right)}{h}\right)$
$\left(x-1\right)^2\left(2x+1\right)^2$
$8m-3m+5m$
$81-5x\le108-8x$
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