$2m^2-100$
$\frac{2p^4}{9r^7}\left(-3\right)$
$42\cdot210$
$660.350\:+\:-293000$
$\left(x-1+3i\right)\left(x-1-3i\right)\left(x+4\right)$
$\left(-3\right)-2\cdot\left(4-1\right)$
$\sqrt{5}-2\sqrt{5}$
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