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3943.5=15.25d-250
We move all terms to the left:
3943.5-(15.25d-250)=0
We get rid of parentheses
-15.25d+250+3943.5=0
We add all the numbers together, and all the variables
-15.25d+4193.5=0
We move all terms containing d to the left, all other terms to the right
-15.25d=-4193.5
d=-4193.5/-15.25
d=274+1/1.0166666666667
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