$2x\:+\:9x\:-1$
$-8\left(7+5x\right)$
$-5x-1$
$\left(2.71828182846^{7.2}\right)$
$11,2+4,6+4,18$
$\left(5+x-2x^2+1\right)$
$\lim_{n\to\infty}\left(n^22^{-n}\right)$
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