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85=9d+4
We move all terms to the left:
85-(9d+4)=0
We get rid of parentheses
-9d-4+85=0
We add all the numbers together, and all the variables
-9d+81=0
We move all terms containing d to the left, all other terms to the right
-9d=-81
d=-81/-9
d=+9
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