$765=x-254$
$-6^3$
$x^4\frac{dy}{dx}+4x^3y=e^{-x}x$
$\left(8ab^2\right)\cdot\left(2a\right)$
$\int20sin^2\left(2x\right)cos^2\left(2x\right)dx$
$8x\:-\:9\:\le\:15$
$\frac{x}{x+4}+\frac{3x}{x^2+5x+4}=\frac{2}{x+1}$
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