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F₁/d + F₂/f =1
F₂/f =1-F₁/d
F₂/f =(d-F₁)/d
f/F₂=d/(d-F₁) /*F₂
f=dF₂/(d-F₁)
F₂/f=1-F₁/d
f=F₂/(1-F₁/d)