$x-\sqrt{x-1}=1$
$-3-8-7$
$\frac{x^2}{3}-x$
$-7\:\left(7\right)$
$3\left\{4\left(2668+46\right)+201-165\right\}$
$a^2+42>0$
$670\:-\:\left(-\:340\right)$
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