$\left(21:3\right)+4\left(-3\right)^3+\left[\left(-3\right)\right]$
$-4=2x-14$
$x^4\left(2x-3x^{-2}\right)$
$-5+4-\left(-2\right)+7-\left(-3\right)$
$30-13c-c^2$
$5^5^5^5^5$
$\int\frac{3-x^2}{\sqrt{25-x^2}}dx$
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