$21b+7$
$\left(2+x\right)\frac{dy}{dx}=2y$
$\int\left(e^{\frac{x}{2}}\right)dx$
$15-1$
$\int_{-977}^{977}\left(x^5\right)dx$
$\sqrt{1-x^2}\frac{dy}{dx}+y^3$
$\left(x+1\right)^3\cdot\left(x+1\right)^3$
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