`(x+y+1)(L+m)-2(l^(2)+m^(2))(lx+my+n)=0` `(x+y+1)(l^(2)+m^(2))-2(l+m)(lx+my+n)=0` `(l+m+1)(x+y)-2(lx+my)(l^(2)+m^(2))=0`NONE of these
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