$23+\left(-79-38\right)$
$\left(7+x^2\right)\left(7-x^2\right)$
$-6+\left(-3\right)\cdot\left(-7\right)$
$\frac{dy}{dx}+2xy=4x$
$\frac{z^{12}+4}{2+z^6}$
$\int3\left(3x-7\right)^4dx$
$r^2-12r+41=0$
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