Usually something like that would require string operations which we do not have, but you can probably use int() to get it right.
val -> "20 (43)"
int(val) -> 2043 (maybe)
val / 100 -> 20.43
int(val) -> 20
Though we would only want the 3rd line to happen if val > 100. So I guess something like...
val=int(val)
OVER=val > 100
val2=val / 100
val=OVER ? val2 : val
val=int(val)
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