$1x-2x-\left(x+1\right)\:=\:7$
$\frac{\sqrt{b}-\sqrt{a}}{2b^2-2a^2}$
$n^6-14n^4+49n^2-36$
$\left(5m-7n\right)^2$
$\int_0^b\left(4e^{-2x}\right)dx$
$5x^2-12x-5$
$\lim_{x\to0}\left(2+x^5ln\left(x\right)\right)$
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