simplify (X + 2 y) (3 x-y) minus (x + y) (x-y)
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(x+ 2y) (3x - y) - (x+y) (x-y)
= 3x^2 -xy + 6xy -2 y^2 -x^2 + y^2
= 2x^2 + 5xy - y^2
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