Solve for d
d=8
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13=2d-3
Add 9 and 4 to get 13.
2d-3=13
Swap sides so that all variable terms are on the left hand side.
2d=13+3
Add 3 to both sides.
2d=16
Add 13 and 3 to get 16.
d=\frac{16}{2}
Divide both sides by 2.
d=8
Divide 16 by 2 to get 8.
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