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0.90d=0.89d+10
We move all terms to the left:
0.90d-(0.89d+10)=0
We get rid of parentheses
0.90d-0.89d-10=0
We add all the numbers together, and all the variables
0.01d-10=0
We move all terms containing d to the left, all other terms to the right
0.01d=10
d=10/0.01
d=1000
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