$\frac{3-x^2}{x^2-5}$
$k^2+11k^2+30$
$100-+8+-72-52+110$
$4.5\:\cdot\:2.5\:$
$5v-v-v$
$\left(x^2+4x+4\right)^{\left(x^2+6x+6\right)}^{-6}$
$\left(-2-6\right)\left(-5\right)$
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