A cura di: Alfredo Bochicchio
$2xy+(-1/2a^2)+(-1/3xy)-(-2xy)$
$2xy-1/2a^2-1/3xy+2xy$
$(2+2-1/3)xy-1/2a$
$(4-1/3)xy-1/2a$
$(12-1)/3xy-1/2a$
$11/3xy-1/2a^2$
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