$\frac{p}{5}+2=-5$
$2x^2-4xy-6x^2$
$10n^3-9n^2+n$
$2\sin\left(\frac{\pi}{4}\right)\cos\left(\frac{\pi}{4}\right)\left(\sin^2\frac{\pi}{6}+\cos^2\left(\frac{\pi}{6}\right)\right)$
$-3x^2+2y^2+3y^2$
$5x+25$
$x^4+4x^2+16$
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