$\frac{\left(x-1\right)}{\left(x^2-2x\right)}$
$+1348-50+736+773+584-828$
$\:972,4-39,67$
$x^2+54+648$
$\frac{\sqrt{7x}}{6}$
$3x^2+17x-6$
$\left[\left(2a\right)^{-2}\right]^3$
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