$3m-n+4m+2m$
$\lim_{x\to0}\left(\frac{\left(\sqrt{1+4x}-\sqrt{1-8x}\right)}{x}\right)$
$4n^2+28n-49$
$\frac{2}{\frac{2}{x}}$
$\left(\frac{8}{4}z^4\right)$
$\int3x^{-2}dx$
$x^2-7x+12.25$
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