factorise (X+Y) (2X+3Y)-(X+Y) (X+1)
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Y, X = variable
2x2 + 2xy + 3y2 - x2 - xy - y
2x2 - x2 + 3y2 + 2xy - xy - x - y
x2 + 3y2 + xy - x - y <—- Answer
2x2 + 2xy + 3y2 - x2 - xy - y
2x2 - x2 + 3y2 + 2xy - xy - x - y
x2 + 3y2 + xy - x - y <—- Answer
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