$\left(r+8\right)^2$
$\frac{6x}{x^{2+4}}$
$\frac{dy}{dx}=-\frac{7y^2}{x^7}$
$\frac{x^3+3}{x^2+1}$
$2\left(3z-1\right)-7$
$-30a^2b+25a^4+9a^4$
$\sqrt{25}+9^2+\left(2\cdot10\right)-\sqrt{100}$
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