$x-\sqrt{2x-1}=2$
$m^4-7m^2-18m\:=0$
$-2v+\left(-4\right)+8+\left(-3v\right)$
$\lim_{x\to1}\left(\frac{e^x-cosx}{xsinx}\right)$
$-189\:_{\:-21}$
$-8\left(12y\right)$
$\left(a^4-b^4-a^4b^4\right)\left(-ab\right)$
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