$\int\frac{-2x}{\left(x+3\right)\left(2x+1\right)}dx$
$\frac{dy}{dx}=\frac{2x}{3y}$
$\left(a^3-\:7b^2\right)\:\left(7b^2\:+\:a^3\right)$
$2x-8>20$
$7\sqrt{7}\cdot2$
$8a^{x-2}b^{x-3}-25a^{x-2}b^{x-3}$
$4-5\cdot\left\{2-3\cdot\left[-4+2\cdot\left(5-4\right)\cdot\left(-1\right)\right]\cdot\left(-1\right)\right\}\cdot\left(-1\right)$
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