could the answer to this be a -3?

16/a = 16/b +16/c which of the following expresses a in terms of b and c a. a= (b+c)/bc b. a= bc/(b+c) c. a=bc(b+c) d. 16bc (b+c) (sorry I can't find the question)

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Hi everyone, I’m a rising sophomore and want to raise my PSAT and SAT score, I will be attempting the SAT for the first time this year. I got a 1040 on my PSAT 8/9 and I’m hoping to get it up, my weakest category is expression of ideas.