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920=2d+250
We move all terms to the left:
920-(2d+250)=0
We get rid of parentheses
-2d-250+920=0
We add all the numbers together, and all the variables
-2d+670=0
We move all terms containing d to the left, all other terms to the right
-2d=-670
d=-670/-2
d=+335
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