$-613-421-700$
$7x\left(7x^3+\frac{4}{x-3}\right)$
$\frac{x^2-7x+5}{x-5}$
$36-4x^4$
$\left(2a\:+\:7\:\right)\:\left(\:2a\:\:-\:\:9\:\right)\:\:\:\:$
$6.25\cdot10^5$
$\left(x^2-5x-14\right)-\left(x-2\right)$
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