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I need help with this problem it
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I need help with this problem it

I need help with this problem it-example-1
User Verveguy
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(1)/(u) + (1)/(v) = (1)/(f) \\ \\ (1)/(u) = (1)/(f) - (1)/(v) \\ \\ (1)/(u) = (1)/(f) ( (v)/(v) )- (1)/(v) ( (f)/(f) ) \\ \\ (1)/(u) = (v)/(vf) - (f)/(vf) \\ \\ (1)/(u) = (v - f)/(vf) \\ \\ u = (vf)/(v-f)
User NotSimon
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