$\frac{5}{4.83}$
$a+b\cdot3=3a+3b$
$\left(5m^2-n\right)^2$
$n2-4$
$238+574-638$
$\frac{-x^4-4x^3+6x^2-7}{x^2-2}$
$-5n\:-2\:\cdot\:2n$
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