I need to think over it before deciding on.
Is this right?
kumenglish to think over it Not really. kumenglish before deciding on No. I need to think it over before deciding [on it].
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kumenglishto think over it
Not really.
kumenglishbefore deciding on
No.
I need to think it over before deciding [on it].
The second 'it' is implied, but if you use 'on' then you need to include 'it' as well. I would leave both off, or replace 'deciding' with 'making a decision'.