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16d+8=8d+64
We move all terms to the left:
16d+8-(8d+64)=0
We get rid of parentheses
16d-8d-64+8=0
We add all the numbers together, and all the variables
8d-56=0
We move all terms containing d to the left, all other terms to the right
8d=56
d=56/8
d=7
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