Changing the subject of a formula

So i found a question which i think looks and is tricky: 1/x = 1/a + 1/b Find x as the subject..Lead me through it please

Answers
1/x=(b+a)/ab
Mohammad Naeem A.
21 June 2012
after cross multiplication: x=ab/(a+b)
Mohammad Naeem A.
21 June 2012
Is this making sense to you.
Mohammad Naeem A.
21 June 2012
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