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99=0.1d+98
We move all terms to the left:
99-(0.1d+98)=0
We get rid of parentheses
-0.1d-98+99=0
We add all the numbers together, and all the variables
-0.1d+1=0
We move all terms containing d to the left, all other terms to the right
-0.1d=-1
d=-1/-0.1
d=+10
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