$5x+1-2x-3$
$\int_{-\infty}^5\left(xe^x\right)dx$
$\frac{6x^2+21x+15}{2x+5}$
$\left(f-n-3z\right)\left(f-n-7z\right)$
$\frac{b^{-1}}{b^{-7}}$
$\sqrt{5z}\cdot\sqrt{3z}$
$4\sqrt{6x^4}$
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