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+1/22a^3c-1/2a^3c-1/2a^3c2a^3c-1a^3c1a^3ca^3c