$500\:\:+\:\:\left[\:1\:200\::\:\left(\:10\:-\:\left[\:12^2\:-\:71\:x\:2\:\right]\:\right)\:\:\right]$
$1+\left(-3\right)-\left(-2\right)$
$\left(9\:+\:x^4\right)\left(9\:-\:x^4\right)$
$\left(8x^2\right)\left(x+3\right)$
$-5x-4=-19$
$\frac{x^3+5x-4}{x^2-x+1}$
$7p-\left(-5\right)+-1$
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