$x^5+6x^4+9x^3\:-x^2-6x-9$
$9x^2-7x\le5+3x+9x^2$
$\int\frac{x+1}{\sqrt[2]{x^2-9}}dx$
$-8.349+-6.774$
$10k+1+8k+2$
$\frac{dy}{dx}+y=650$
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