Answer
$x=-3$
Work Step by Step
$\sqrt{1-x}-3=x+2\\\sqrt{1-x}=x+5\\1-x=x^2+10x+25\\x^2+11x+24=0\\(x+3)(x+8)=0$
So $x=-3$ or $x=-8$ (but this is extraneous), so $x=-3$
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