$\left(-5\right)^{-10}\cdot\left(-5\right)^{15}$
$3r^2+21r+30$
$-45:\:-\:7$
$\frac{x}{9}-1=5$
$\frac{dy}{dx}=x^7e^x$
$-5-3\cdot0$
$\left(40x^3+30x^2-12x+12\right)\left(40x^4+23\right)$
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