$x^2+4x+8$
$15n+2n-8n$
$\int\frac{\sqrt{x}-5}{\sqrt{x}+3}dx$
$\frac{10^{-2}}{5^{-2}}$
$k2\:+\:26k\:+\:169\:$
$2\cdot2+3$
$8m^2m\:-12m$
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