Solve for d
d=3
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2d-3=\frac{21}{7}
Divide both sides by 7.
2d-3=3
Divide 21 by 7 to get 3.
2d=3+3
Add 3 to both sides.
2d=6
Add 3 and 3 to get 6.
d=\frac{6}{2}
Divide both sides by 2.
d=3
Divide 6 by 2 to get 3.
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