$\frac{\left(\left(-1\right)^n\cdot\:\sqrt{n}\right)}{4^{n+1}}\cdot\left(x-2\right)^n$
$\int_1^{\infty}\left(\frac{5}{\sqrt{x}}\right)dx$
$\left(a^2+5x-8y+15\right)+\left(5a^2-3x+y-2\right)$
$\frac{m^3-343b^6}{m-7b^2}$
$16a^2-b^2$
$6x^2-10x+1$
$7+10y=10y+7$
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