$y^4+y^2=0$
$12x^2-6-6x$
$\frac{d}{dx}\left(\frac{-8x}{x^4-8x^2+16}\right)$
$22b+7-12b-5-10b-2$
$16n^{2\:}-\:9$
$12-\left(24-\:\left(-12+\:\left(-8+18-6\right)\right)\right)$
$a+a=2b$
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