lg(x+y) + lg(2x+3y) - lg3= lg4+lgx+lgy
lg(x+y)+ lg(2x+3y) = lg3 +lg4+lgx+lgy
lg[(x+y)*(2x+3y)] = lg[ 3*4*xy)
(x+y)(2x+3y)=12xy
lg(x+y) + lg(2x+3y) - lg3= lg4+lgx+lgy
lg(x+y)+ lg(2x+3y) = lg3 +lg4+lgx+lgy
lg[(x+y)*(2x+3y)] = lg[ 3*4*xy)
(x+y)(2x+3y)=12xy