Answer the 5th one step by step
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(x-2y+1)(x-2y)-(x+y+1)(x-2y)
x(x-2y+1)-2y(x-2y+1)-x(x+y+1)-2y(x+y+1)
x²-2xy+x-2xy+4y²-2y-x²-xy-x-2xy-2y²-2y
-6xy+2y²-4y
x(x-2y+1)-2y(x-2y+1)-x(x+y+1)-2y(x+y+1)
x²-2xy+x-2xy+4y²-2y-x²-xy-x-2xy-2y²-2y
-6xy+2y²-4y
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