Solve the following simultaneous equations for X and y.
m(X+y)+m(x-y)-(m²+MN+n²)=0;
n(X+y)+m(x-y)-(m²-mn+n²)=0.
(1) let X+y=a , x-y=b.
(2) transfer the terms not containing X and y to RHS.
Add questions, substitute the values of a and b and solve.
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