1/f + 1/d = 1/F
F !!!!!!!!
1/F = (d+f)/f*d
F=f*d/(f+d)
f!!!!!!!!
1/f = 1/F - 1/d
1/f = (d-F)/d*F
f = d*F/(d-F)
d !!!!!!
1/d = 1/F - 1/f
1/d = (f - F)/f*F
d = f*F /(f-F)
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Verified answer
1/f + 1/d = 1/F
F !!!!!!!!
1/F = (d+f)/f*d
F=f*d/(f+d)
f!!!!!!!!
1/f = 1/F - 1/d
1/f = (d-F)/d*F
f = d*F/(d-F)
d !!!!!!
1/d = 1/F - 1/f
1/d = (f - F)/f*F
d = f*F /(f-F)