Solve for d
d=\frac{9}{31}\approx 0.290322581
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2d-9+29d=0
Add 29d to both sides.
31d-9=0
Combine 2d and 29d to get 31d.
31d=9
Add 9 to both sides. Anything plus zero gives itself.
d=\frac{9}{31}
Divide both sides by 31.
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