$d^2+5d$
$\frac{x+3}{2-x}\le4$
$\left(\frac{\left(-a^6b^{-2}c^{-1}\right)}{\left(4a^2b^5c^{-7}\right)}\right)^{-3}$
$-4x+9<x-1$
$0.48-0.81$
$12yx\:+\:3ab\:-18xy\:+\:7ba$
$\sec^4\left(a\right)-\tan^4\left(a\right)=1+2\tan^2\left(a\right)$
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