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2(2d+4)=d+1
We move all terms to the left:
2(2d+4)-(d+1)=0
We multiply parentheses
4d-(d+1)+8=0
We get rid of parentheses
4d-d-1+8=0
We add all the numbers together, and all the variables
3d+7=0
We move all terms containing d to the left, all other terms to the right
3d=-7
d=-7/3
d=-2+1/3
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