A cura di: Alfredo Bochicchio

$2a^3c+(-1/2a^3c)+(-1/2)-(+a^3c)-(-a^3c)+(-1/2a^rc)-(-1/2)$
$2a^3c-1/2a^3c-1/2-a^3c+a^3c-1/2a^3c+1/2$
$2a^3c-1/2a^3c-1/2a^3c$
$2a^3c-1a^3c$
$1a^3c$
$a^3c$