$15r-21r$
$49x^2+121+154x$
$\frac{dy}{dx}=\frac{3x^2y}{3x^3+2}$
$\left(\frac{1}{3}x^2y-\frac{3}{2}mn\right)^2-\left(\frac{4}{9}x^2+5mn\right)^2$
$\left(a^{x-1}\right)\left(5a^x\right)$
$8x+20=14+5x$
$\int\left(\frac{3x}{\left(4x^2-1\right)^5}\right)dx$
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