$$(x+6)(x-1)+5= { x }^{ 2 } -6$$
$x=-1$
$$x^{2}+5x-6+5=x^{2}-6$$
$$x^{2}+5x-1=x^{2}-6$$
$$x^{2}+5x-1-x^{2}=-6$$
$$5x-1=-6$$
$$5x=-6+1$$
$$5x=-5$$
$$x=\frac{-5}{5}$$
$$x=-1$$
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