Solve for d
d=7
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2.5+2d=16.5
Swap sides so that all variable terms are on the left hand side.
2d=16.5-2.5
Subtract 2.5 from both sides.
2d=14
Subtract 2.5 from 16.5 to get 14.
d=\frac{14}{2}
Divide both sides by 2.
d=7
Divide 14 by 2 to get 7.
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