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5d-8=3+4+2d
We move all terms to the left:
5d-8-(3+4+2d)=0
We add all the numbers together, and all the variables
5d-(2d+7)-8=0
We get rid of parentheses
5d-2d-7-8=0
We add all the numbers together, and all the variables
3d-15=0
We move all terms containing d to the left, all other terms to the right
3d=15
d=15/3
d=5
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