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850(1-d)=200
We move all terms to the left:
850(1-d)-(200)=0
We add all the numbers together, and all the variables
850(-1d+1)-200=0
We multiply parentheses
-850d+850-200=0
We add all the numbers together, and all the variables
-850d+650=0
We move all terms containing d to the left, all other terms to the right
-850d=-650
d=-650/-850
d=13/17
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