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72-x-x^2 factorise with complete method
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x^2-x-72
=x^2-9x+8x-72
x(x-9)+8(x-9)
(x-9)(x+8)
=x^2-9x+8x-72
x(x-9)+8(x-9)
(x-9)(x+8)
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2
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