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I didn't see calculation part -v is missing
e=$( awk -v var1=$a -v var2=$b -v var3=$c -v var4=$d 'BEGIN{print var1 * var2 / var3 + var4}' )

It looks like the commands you're using to set A and B are adding trailing carriage returns.

You can get rid of them (and any other non-numeric characters) with:
A=$(printf "%s" "$A"|tr -dc...