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400=75d+1.000
We move all terms to the left:
400-(75d+1.000)=0
We add all the numbers together, and all the variables
-(75d+1)+400=0
We get rid of parentheses
-75d-1+400=0
We add all the numbers together, and all the variables
-75d+399=0
We move all terms containing d to the left, all other terms to the right
-75d=-399
d=-399/-75
d=5+8/25
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