How to eliminate divide by zero error

Hello - I'm looking to eliminate the divide by zero error using coalesce on the following code. Not sure how to incorporate on another
function. Please help!!

(round((case when(d.NUM_INC)=0 then 0 else (d.DUR_INCd. IN_WRAPUP_TIMEd.
DUR_HOLD)/d.NUM_INC end),0)/round(((case when(d.NUM_INC)=0 then 0 else (d.DUR_INC-d.IN_WRAPUP_TIME-d.DUR_HOLD)/d.NUM_INC end + case

when(d.NUM_INC)=0 then 0 else d.DUR_HOLD/d.NUM_INC end + case
when(d.NUM_INC)=0 then 0 else (d.OUT_WRAPUP_TIME+d.IN_WRAPUP_TIME)/
d.NUM_INC end)),0))