$\frac{x^2-2x-3}{x-1}$
$-70\cdot80$
$16+40x^2+25a^2^2$
$\frac{dy}{dx}=5xe^{-y},\:y\left(0\right)=-3$
$10-\left(-11\right)$
$x^2+2xy+x^2$
$-54x-16$
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