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0.99=10d+0.89
We move all terms to the left:
0.99-(10d+0.89)=0
We get rid of parentheses
-10d-0.89+0.99=0
We add all the numbers together, and all the variables
-10d+0.1=0
We move all terms containing d to the left, all other terms to the right
-10d=-0.1
d=-0.1/-10
d=0.1/10
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