Solve for d
d=4
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d=20-4d
Use the distributive property to multiply 5-d by 4.
d+4d=20
Add 4d to both sides.
5d=20
Combine d and 4d to get 5d.
d=\frac{20}{5}
Divide both sides by 5.
d=4
Divide 20 by 5 to get 4.
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