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89d=400+20d
We move all terms to the left:
89d-(400+20d)=0
We add all the numbers together, and all the variables
89d-(20d+400)=0
We get rid of parentheses
89d-20d-400=0
We add all the numbers together, and all the variables
69d-400=0
We move all terms containing d to the left, all other terms to the right
69d=400
d=400/69
d=5+55/69
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