$\int\frac{x-1}{x^2\left(x^2+1\right)}dx$
$\frac{d}{dx}\left(x^x\right)3\ln\left(x\right)$
$\frac{3n}{n+3}+\frac{5}{n-4}$
$4ab-3bc$
$16-8-\left(2+10\right)-\left(12-2-8\right)^2$
$x^2\:-\:14x\:+\:49\:=\:16$
$7x^{16}-7y^{16}$
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