how much weight will i lose riding a stationary bike for an hour and eating 900...

We need to know more. Are you male or female? Height? Weight? etc. All of these are variables that matter. You should talk to a doctor...I know you don't want to hear that...sorry.
 
The thing is, I CAN'T answer that because everybody's body is different. However, you'd be likely to lose more weight if you bumped up your calories to 1200 or so, so you don't slow down your metabolism.
 
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