Answer
$0\gt -9$
Work Step by Step
If $a-b \lt 0$, then $a \lt b;$
If $a-b \gt 0$, then $a \gt b;$
If $a-b = 0$, then $a=b;$
In this problem, $a=0, b=-9,$
Since $a-b=0-(-9)=0+9=9\gt0,$
Then $a\gt b,$
Therefore, $0\gt -9$
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