A cura di: Alfredo Bochicchio
$-2ax-(-3a^2x)+(+1/3ax)-(-a^2x)$
$-2ax+3a^2x+1/3ax+a^2x$
$(-2+1/3)ax+(3+1)a^2x$
$(-6+1)/3ax+4a^2x$
$-5/3ax+4a^2x$
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