$27^{x-4}=9^{2x+1}$
$\frac{d}{dx}\sqrt{5x^2+2x+2}$
$21b+21c$
$2x+7<1$
$\left(\sqrt{5x\:+2\:\sqrt{7y}}\right)^3$
$\frac{3x^4-4x^2+3x-7}{x-4}$
$-18\:\:\left(-8\:-\:24\right)\::\:2$
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