1. The problem statement, all variables and given/known data Solve the formula f=1/1/a+1/b for a in terms of b and f. 3. The attempt at a solution My attempt at this problem was to first multiply all terms by ab, thus getting rid of the fractions in the denominator on the right. I was then left with the equation fab=ab/(b+a), so I multiplied each side by (b+a), the equation now looks like (b+a)fab=ab, I then divided by ab, and was left with f(b+a)=1, I then dived by f , and subtract b, and am left with; a=1-b/f. Now, the correct answer, according to my textbook, is a =bf/b-f. All I can find on the internet or in my textbook is how to deal with a an expression containing complex fractions, but nothing on equations containing complex fractions, so I'm at somewhat of a loss as to what I'm doing wrong. Anyway, I appreciate any guidance on how to solve this that anyone has to offer. Also, an apology for not using Latex. I'm on my phone, and it looked as if it doesn't work on phones. I tried my best to be as clear as possible.