$3x-4y-4x+2x+5-y$
$-2xym-2xyn$
$7v+8-2v+1$
$64x^4y\:-\:32x^3y^2\:-\:128x^2y\:+\:16xy\:$
$3a^2-a-2a^2$
$25x^2-50x=0$
$900^2$
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