$6=4+\frac{u}{2.56}$
$\frac{5}{\sqrt{3x-5}}$
$x^2-x>\frac{2}{3}$
$m^3n^2=mn$
$-41-16n$
$a+b+2\:a+b\:-2$
$\frac{-5^1}{-5^0}$
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