$48x^2-10x-28$
$\left(2m^x-3n^y\right)^2$
$8^5\cdot8^{-5}$
$+2020\:+\:-384$
$3a^3-9a^2-24y$
$\left(4.7\right)^2$
$+2\:\:2\:-\:3\:+4\:+\:-3\:-2\:+7\:-3\:\:$
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