$x^2\frac{dy}{dx}+xy=2x^2$
$2\left(7x+8\right)$
$\left(1-i\right)+\left(-1+3i\right)$
$\int13x^3e^{-3x}dx$
$\left[-9-11-\left(-18+21-3\right)+7\right]-\left[-18+21-\left(3-11+15\right)\right]$
$\left(7\right)\cdot\left(-4\right)\cdot\left(2\right)$
$\left(2cosx+1\right)\left(tanx+1\right)=0$
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