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15x-29xyz+19y(27a/2+69y/2+3/2)=
=15x-29xyz+19y*27a/2+19y*69y/2+19y*3/2=
=15x-29xyz+513a/2+1311y²/2+28,5y=
=15x-29xyz+256,5a+655,5y²+28,5y