$\:n\left(n+2\right)$
$4u^2-2un$
$\left(3n+1\right)^2$
$4\left(x+1\right)+1>2\left(x-2\right)+7$
$12x^2-24x^3$
$x^4-6x^3-7x^2$
$5z-6z+8w-z+w$
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