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X2 x a 1 a 2
X2 x a 1 a 2 pictures 5
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X2 x a 1 a 2
x2 x a 1 a 2 0 by factorisation
x2 x a 1 a 2 factorise
x2 x a 1 a 2 0
x2 x a 1 a 2
