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2d=80-8d
We move all terms to the left:
2d-(80-8d)=0
We add all the numbers together, and all the variables
2d-(-8d+80)=0
We get rid of parentheses
2d+8d-80=0
We add all the numbers together, and all the variables
10d-80=0
We move all terms containing d to the left, all other terms to the right
10d=80
d=80/10
d=8
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