Answer
$-45\lt 0$
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, $a=-45, b=0,$
Since $a-b=(-45)-0=-45\lt0,$
Then $a\lt b,$
Therefore, $-45\lt 0$
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