`(2x + 1/3x) = 5`
`(2xxx3x+1)/3x = 5`
`(6x^2+1) = 15x`
`(5x)/(6x^2 + 20x + 1)`
`= (5x)/(6x^2 + 1+20x)`
So the answer is` (5x)/(6x^2 + 20x + 1) =1/7`
Correct answer is a).
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