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OpenStudy (anonymous):
Make b the subject. 1/f = 1/a + 1/b
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OpenStudy (akshay_budhkar):
1/f-1/a=1/b a-f/af=1/b therefore b=af/a-f
OpenStudy (anonymous):
okay I get the first step. Not the second.
OpenStudy (akshay_budhkar):
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