$\frac{2x+6}{4}=\frac{7-x}{8}$
$\frac{dy}{dx}=\frac{2x}{y^4}$
$\sin\frac{\pi}{4}-\frac{\pi}{6}$
$2x^2+6y^2-4y+5y^2+5x^2$
$\frac{d}{dx}\:\left(x+1\right)\left(x-10\right)$
$6x+7y+9x-8y$
$24\left(2\right)^2$
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