Solve for d
d = \frac{9}{4} = 2\frac{1}{4} = 2.25
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3d+5d=18
Add 5d to both sides.
8d=18
Combine 3d and 5d to get 8d.
d=\frac{18}{8}
Divide both sides by 8.
d=\frac{9}{4}
Reduce the fraction \frac{18}{8} to lowest terms by extracting and canceling out 2.
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