Question

1/p+1/q=1/f solve for p

Answer 1

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Answer 2

q/pq +p/pq=1/f
(P+q)/pq=1/f

Answer 3

cross multiply

Answer 4

p+q/pq=1/f
p+q=pq/f
p=(pq/f) - q

Answer 5

1/p+1/f=1/q subtract 1/f from both sides
1/p = 1/q-1/f cross multiply right hand side
1/p = (q-f)/qf invert both sides (1/???)
p=qf/(q-f)