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1/f = 1/u+1/v

Subtract 1/v from both sides:

1/f-1/v = 1/u

Multiply all terms by fv:

fv/f - fv/v = fv/u => v-f = fv/u

Multiply all terms by u:

u(v-f) = fv

Divide both sides by v-f which will then make u the subject of the formula:

u = fv/v-f

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14y ago

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