$6^5\cdot6^3$
$\left(a-2b-3c\right)^2-\left(3a+2b-3c\right)^2$
$21\:+\:\left[-7\:-\:\left(-5\right)\right]\:$
$2x+x^2<3x^2+4$
$-15xy+40x$
$\frac{d^2}{dx^2}\left(x+5\right)$
$9a^2-6ab+6ab-4b^2$
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