$\frac{x^2-7x-9}{x+1}$
$\left(a+2a+b+c\right)$
$23-\left(-19\right)$
$4m+2r$
$-75\:+\:10\:m\:+\:m^2$
$2x^3-18x^3+54x^2-54x$
$4^2-16^2$
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