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(x+1)(x+2)(x+3)(x+4)-24
=(x+1)(x+4)(x+2)(x+3)-24
=(x^2+5x+4)(x^2+5x+6)-24
=(x^2+5x)^2+10(x^2+5x)
=(x^2+5x+10)(x^2+5x)
=x(x^2+5x+10)(x+5)
=(x+1)(x+4)(x+2)(x+3)-24
=(x^2+5x+4)(x^2+5x+6)-24
=(x^2+5x)^2+10(x^2+5x)
=(x^2+5x+10)(x^2+5x)
=x(x^2+5x+10)(x+5)
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