$\frac{d}{dx}-10x^8+2x^{20}y+y^3=-7$
$\frac{dy}{dx}=y^2\sqrt{4-x}$
$-x^2-5x+4$
$65-\left(-12\right)$
$\left(5a^2+3a-5\right)^2$
$\int\left(\frac{0.8e^{-0.05x}}{\left(1+e^{-0.05x}\right)^2}\right)dx$
$x+\frac{5}{2}x$
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