it goes as follows:
ab+c+d=3
bc+d+a=5
cd+a+b=2
da+b+c=6
now the main issue I have with this is that I can't get the products to cancel out, and if I try removing one variable such that a=(3-c-d)/b, I'm left with three variables but when I try to reduce the variables again I get a trivial result like 3=3
ab+c+d=3
bc+d+a=5
cd+a+b=2
da+b+c=6
now the main issue I have with this is that I can't get the products to cancel out, and if I try removing one variable such that a=(3-c-d)/b, I'm left with three variables but when I try to reduce the variables again I get a trivial result like 3=3