x square - (2x)square - 2 (x square -2x) - 3 factorise
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x²-2x²-2(x²-2x)-3
-x²-2x²+4x-3
-3x²+4x-3
x(-3x+4) -3
-x²-2x²+4x-3
-3x²+4x-3
x(-3x+4) -3
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