$\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}+\sqrt{3}\right)$
$-\left(9-15+2\right)+\left\{-6+\left[4-1+\left(12-9\right)+7\right]\right\}-3$
$4x-10=2x+2$
$\frac{4}{s^2+4s+4}$
$\left(2x^2+1\right)\frac{dy}{dx}=\frac{3x}{y}$
$\frac{2\left(x+4\right)}{3}-\frac{y}{2}=\frac{9}{2}$
$-10^2+10+5$
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