$27-\:36\:+\:90\:-\left(-45\right)$
$-1\cdot\left(-3\right)^4:\left(-27\right)$
$3f+7f$
$\frac{dy}{dx}+\frac{cos\left(x\right)}{\sin\left(x\right)}y=\frac{1}{\sin\left(x\right)}$
$6y-8y-4y$
$100\:\left(1596+38\right)-9\left(72-49+56\right)$
$4k^2+64k=-180$
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