Question 847029
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Hi,
{{{cross(x+5)(x+5)/cross(x+5)(x+4) =(x+5)/(x+4)}}} x &#8800; -4
{{{(cross(2x)(x-1)/(x+4)cross(x+1))(cross(x+1)(x+1)/cross(2x)) = (x^2-1)/(x+4) )}}} x &#8800; -4