$a^2+4ua+4ua+\left(4ua\right)^2$
$4x^2-8x+320$
$4a^2\:-12ab\:+\:9b^2$
$-x^2+3x-3-2x^2-x+2$
$-5+1-\left(-8\right)$
$x^4-4x+3$
$3m+4n-6n$
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