How Do You Calculate the Difference Between d and f?

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sfvdsc
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Please Solve this, I am unable. Please, I beg

The question is attached,

I need d - f

Please Help
Screenshot 2021-11-18 at 12.00.49 PM.png
 
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Beer induced query follows.
sfvdsc said:
Please Solve this, I am unable. Please, I beg

The question is attached,

I need d - f

Please Help
View attachment 11488
What have you done so far?