Quantitative Aptitude Ratio and Proportion

If a = 3b, 4b = 5c, 6c = 7d, then what is \(\rm\frac{d+a}{d-a}\) equal to ?

1
\(\rm\frac{27}{43}\)
2
\(\rm\frac{43}{27}\)
3
\(-\rm\frac{27}{43}\)
4
\(-\rm\frac{43}{27}\)

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