$\frac{20m^2n-mn}{9x^2-30xy+25y^2}\ast\:\frac{n^2+n}{m^2-n^2}$
$\left(\frac{a}{b^3}\right)^4$
$16m+6m$
$2du+5d-15u-20d+8du-10d$
$-x^2+9x-20$
$4+3\left(10-2\right)^3$
$2x+4>4x+2$
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