$7-x>5$
$\frac{dy}{dx}\left(\frac{\frac{4}{5}x}{y}\right)$
$20+90+51-12-34$
$\left(\cot x-1\right)^2$
$81\cdot45$
$\left(x^{2\:}+1\right)\frac{dy}{dx}=x\:-4xy$
$2\cdot x^2+32\cdot x+126>0$
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