$\lim_{n\to\infty}\frac{n^2+n}{2n}$
$24+\left(-18\right)-\left(-17\right)-63$
$5\left(3x-6\right)$
$15x^2-x-2$
$-4ab\cdot\left(2a-6b+4c\right)$
$8a^3g^3+27b^3d^6$
$\left(9+2b\right)^3$
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