$-4x-20+2x-18$
$\left(6h+2k\right)\left(5h+4k\right)$
$\lim_{x\to\infty}\:\left(\sqrt{x^2+x}\right)-\left(\sqrt{x^2-x}\right)$
$\int_5^{3u-4}dx$
$\int_2^{\infty}\left(\frac{2x^2-1}{x^2\left(x-1\right)}\right)dx$
$\left(2t-5\right).\left(2t+7\right)$
$10\:x\:10^8$
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