Solve for d
d=700
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250+2d=1650
Swap sides so that all variable terms are on the left hand side.
2d=1650-250
Subtract 250 from both sides.
2d=1400
Subtract 250 from 1650 to get 1400.
d=\frac{1400}{2}
Divide both sides by 2.
d=700
Divide 1400 by 2 to get 700.
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