$-\left(3u-2x-1\right)$
$x^2+5;\:x=1$
$2x^7+4x^2-5x$
$2\sec^2\left(x\right)+\tan\left(x\right)=5$
$2x^2\left(x^4+2y\right)$
$\frac{3x^3-45x-12}{x-4}$
$-6-7f-4f-2-3f+8-2f$
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