$-12\:-\:\left(-23\right)\:+\:8\:+\:\left(-14\right)$
$12-2020$
$-6x-19+15x$
$-19=x-19$
$\left(5x-11\right)^3$
$x^9-\frac{1}{x}$
$\left(2p+q\right)\left(2p-q\right)\left(4p^2+q^2\right)$
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