Solve for d
d=4
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5d-12=8
Swap sides so that all variable terms are on the left hand side.
5d=8+12
Add 12 to both sides.
5d=20
Add 8 and 12 to get 20.
d=\frac{20}{5}
Divide both sides by 5.
d=4
Divide 20 by 5 to get 4.
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