$\int\frac{e^x}{\left(5+7e^x\right)^{-1}}dx$
$-8x^2-24x=0$
$\left(xy+x+y+1\right)dx=\left(xy-x-y+1\right)dy$
$\frac{20}{-5}+\frac{12}{-2}$
$7^{2x-1}=7^{x+1}$
$\int x^2\sec\left(5x^3\right)dx$
$\frac{d}{dx}-\frac{1}{3}$
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