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200=850(1-d)
We move all terms to the left:
200-(850(1-d))=0
We add all the numbers together, and all the variables
-(850(-1d+1))+200=0
We calculate terms in parentheses: -(850(-1d+1)), so:We get rid of parentheses
850(-1d+1)
We multiply parentheses
-850d+850
Back to the equation:
-(-850d+850)
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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