$2+\left(7-3\right)-\left(8-4\right)$
$\frac{19n^3+38n^2}{-57n^3+38n^2}$
$6m-17m+8m-14m+3m-m$
$\ln\left(1+y\right)=\frac{1}{2}\ln\left(1+x^2\right)$
$4y+2x-2y$
$\frac{9x^2}{4}-\frac{16y^2}{25}$
$y^2+18y$
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