$\lim_{x\to0}\left(\frac{1}{x}-\frac{1}{1-e^x}\right)$
$-3\left(2\right)+1$
$\left(-\:40\:+\:5\right)\::\:\left(-\:7\right)\:$
$\left(2w+4y\right)^2$
$7a\:+\:7b\:-\:7c\:-\:7$
$a^2+20a$
$\ln\left(3-9x\right)$
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